EXIF improvements and bugfixes

- Fixes a writing issue for float values ​​less than 1
- Fixes a missing definition of `EXIF_DATETIMEDIGITIZED` tag
- Adds support for some common camera shot metadata
- Adds missing metadata to writing tests

The following plugins automatically gain support for the new metadata: AVIF, IFF, HEIF, JXL, JXR, PSD and TGA (V2E).

The new metadata added with this patch is usually saved by smartphones (e.g. iPhone or Google Pixel).

README.md

@@ -155,8 +155,31 @@ About the image:
 - `Owner`: Name of the owner of the image.
 - `Software`: Name and version number of the software package(s) used to 
   create the image.
+- `Speed`: Floating-point number indicating the speed of GPS receiver 
+  movement in Km/h (e.g. 30.2).
 - `Title`: The title of the image.
 
+About the shot:
+- `DigitalZoomRatio`: Floating-point number indicating the digital zoom ratio
+  when the image was shot.
+- `ExposureMode`: Integer number indicating the exposure mode set when the 
+  image was shot as reported in the EXIF ​​specifications.
+- `ExposureProgram`: Integer number indicating the class of the program used 
+  by the camera to set exposure when the picture is taken as reported in the 
+  EXIF ​​specifications.
+- `ExposureTime`: Floating-point number indicating the exposure time, 
+  given in seconds (s).
+- `Flash`: Integer number indicating the status of flash when the image 
+  was shot as reported in the EXIF ​​specifications.
+- `FNumber`: Floating-point number indicating the F number.
+- `FocalLength`: Floating-point number indicating the actual focal length 
+  of the lens, in millimeters (mm).
+- `ISOSpeedRatings`: Integer number indicating the sensitivity of the camera 
+  or input device when the image was shot as reported in the EXIF 
+  ​​specifications.
+- `WhiteBalance`: Integer number indicating the white balance mode set when 
+  the image was shot as reported in the EXIF ​​specifications.
+
 About the camera:
 - `Manufacturer`: The manufacturer of the recording equipment.
 - `Model`: The model name or model number of the recording equipment.

autotests/write/basic/jxl.json

@@ -13,14 +13,18 @@
             "key" : "ModificationDate",
             "value" : "2025-02-14T15:58:44+01:00"
         },
-        {
-            "key" : "Software" ,
-            "value" : "Adobe Photoshop 26.2 (Windows)"
-        },
         {
             "key" : "Altitude",
             "value" : "34"
         },
+        {
+            "key" : "Title",
+            "value" : "A test"
+        },
+        {
+            "key" : "Software",
+            "value" : "KImageFormats write test"
+        },
         {
             "key" : "Author",
             "value" : "KDE Project"
@@ -45,6 +49,10 @@
             "key" : "LensModel",
             "value" : "A1234"
         },
+        {
+            "key" : "LensSerialNumber",
+            "value" : "S/N:1234567"
+        },
         {
             "key" : "Longitude",
             "value" : "10.9254"
@@ -56,6 +64,50 @@
         {
             "key" : "Model",
             "value" : "KImageFormats"
+        },
+        {
+            "key" : "SerialNumber",
+            "value" : "S/N:7654321"
+        },
+        {
+            "key" : "Speed",
+            "value" : "13.2"
+        },
+        {
+            "key" : "DigitalZoomRatio",
+            "value" : "3.4"
+        },
+        {
+            "key" : "ExposureMode",
+            "value" : "2"
+        },
+        {
+            "key" : "ExposureProgram",
+            "value" : "6"
+        },
+        {
+            "key" : "ExposureTime",
+            "value" : "0.004"
+        },
+        {
+            "key" : "Flash",
+            "value" : "16"
+        },
+        {
+            "key" : "FNumber",
+            "value" : "1.6"
+        },
+        {
+            "key" : "FocalLength",
+            "value" : "5.96"
+        },
+        {
+            "key" : "ISOSpeedRatings",
+            "value" : "50"
+        },
+        {
+            "key" : "WhiteBalance",
+            "value" : "1"
         }
     ],
     "resolution" : {

autotests/write/basic/jxr.json

@@ -41,6 +41,10 @@
             "key" : "LensModel",
             "value" : "A1234"
         },
+        {
+            "key" : "LensSerialNumber",
+            "value" : "S/N:1234567"
+        },
         {
             "key" : "Longitude",
             "value" : "10.9254"
@@ -52,6 +56,50 @@
         {
             "key" : "Model",
             "value" : "KImageFormats"
+        },
+        {
+            "key" : "SerialNumber",
+            "value" : "S/N:7654321"
+        },
+        {
+            "key" : "Speed",
+            "value" : "13.2"
+        },
+        {
+            "key" : "DigitalZoomRatio",
+            "value" : "3.4"
+        },
+        {
+            "key" : "ExposureMode",
+            "value" : "2"
+        },
+        {
+            "key" : "ExposureProgram",
+            "value" : "6"
+        },
+        {
+            "key" : "ExposureTime",
+            "value" : "0.004"
+        },
+        {
+            "key" : "Flash",
+            "value" : "16"
+        },
+        {
+            "key" : "FNumber",
+            "value" : "1.6"
+        },
+        {
+            "key" : "FocalLength",
+            "value" : "5.96"
+        },
+        {
+            "key" : "ISOSpeedRatings",
+            "value" : "50"
+        },
+        {
+            "key" : "WhiteBalance",
+            "value" : "1"
         }
     ],
     "resolution" : {

autotests/writetest.cpp

@@ -62,7 +62,7 @@ void setOptionalInfo(QImage &image, const QString &suffix)
 
     // Set metadata
     auto meta = obj.value("metadata").toArray();
-    for (auto jv : meta) {
+    for (auto &&jv : meta) {
         auto obj = jv.toObject();
         auto key = obj.value("key").toString();
         auto val = obj.value("value").toString();
@@ -106,7 +106,7 @@ bool checkOptionalInfo(QImage &image, const QString &suffix)
 
     // Test metadata
     auto meta = obj.value("metadata").toArray();
-    for (auto jv : meta) {
+    for (auto &&jv : meta) {
         auto obj = jv.toObject();
         auto key = obj.value("key").toString();
         auto val = obj.value("value").toString();

src/imageformats/microexif.cpp

@@ -36,17 +36,26 @@
 #define TIFF_VAL_URES_CENTIMETER 3
 
 // EXIF 3 specs
+#define EXIF_EXPOSURETIME 0x829A
+#define EXIF_FNUMBER 0x829D
 #define EXIF_EXIFIFD 0x8769
+#define EXIF_EXPOSUREPROGRAM 0x8822
 #define EXIF_GPSIFD 0x8825
+#define EXIF_ISOSPEEDRATINGS 0x8827
 #define EXIF_EXIFVERSION 0x9000
 #define EXIF_DATETIMEORIGINAL 0x9003
 #define EXIF_DATETIMEDIGITIZED 0x9004
 #define EXIF_OFFSETTIME 0x9010
 #define EXIF_OFFSETTIMEORIGINAL 0x9011
 #define EXIF_OFFSETTIMEDIGITIZED 0x9012
+#define EXIF_FLASH 0x9209
+#define EXIF_FOCALLENGTH 0x920A
 #define EXIF_COLORSPACE 0xA001
 #define EXIF_PIXELXDIM 0xA002
 #define EXIF_PIXELYDIM 0xA003
+#define EXIF_EXPOSUREMODE 0xA402
+#define EXIF_WHITEBALANCE 0xA403
+#define EXIF_DIGITALZOOMRATIO 0xA404
 #define EXIF_IMAGEUNIQUEID 0xA420
 #define EXIF_BODYSERIALNUMBER 0xA431
 #define EXIF_LENSMAKE 0xA433
@@ -64,6 +73,8 @@
 #define GPS_LONGITUDE 4
 #define GPS_ALTITUDEREF 5
 #define GPS_ALTITUDE 6
+#define GPS_SPEEDREF 12
+#define GPS_SPEED 13
 #define GPS_IMGDIRECTIONREF 16
 #define GPS_IMGDIRECTION 17
 #define EXIF_TAG_VALUE(n, byteSize) (((n) << 6) | ((byteSize) & 0x3F))
@@ -123,16 +134,25 @@ static const KnownTags staticTagTypes = {
     TagInfo(TIFF_ARTIST, ExifTagType::Utf8),
     TagInfo(TIFF_DATETIME, ExifTagType::Ascii),
     TagInfo(TIFF_COPYRIGHT, ExifTagType::Utf8),
+    TagInfo(EXIF_EXPOSURETIME, ExifTagType::Rational),
+    TagInfo(EXIF_FNUMBER, ExifTagType::Rational),
     TagInfo(EXIF_EXIFIFD, ExifTagType::Long),
+    TagInfo(EXIF_EXPOSUREPROGRAM, ExifTagType::Short),
     TagInfo(EXIF_GPSIFD, ExifTagType::Long),
+    TagInfo(EXIF_ISOSPEEDRATINGS, ExifTagType::Short),
     TagInfo(EXIF_DATETIMEORIGINAL, ExifTagType::Ascii),
-    TagInfo(EXIF_OFFSETTIMEDIGITIZED, ExifTagType::Ascii),
+    TagInfo(EXIF_DATETIMEDIGITIZED, ExifTagType::Ascii),
     TagInfo(EXIF_OFFSETTIME, ExifTagType::Ascii),
     TagInfo(EXIF_OFFSETTIMEORIGINAL, ExifTagType::Ascii),
     TagInfo(EXIF_OFFSETTIMEDIGITIZED, ExifTagType::Ascii),
+    TagInfo(EXIF_FLASH, ExifTagType::Short),
+    TagInfo(EXIF_FOCALLENGTH, ExifTagType::Rational),
     TagInfo(EXIF_COLORSPACE, ExifTagType::Short),
     TagInfo(EXIF_PIXELXDIM, ExifTagType::Long),
     TagInfo(EXIF_PIXELYDIM, ExifTagType::Long),
+    TagInfo(EXIF_EXPOSUREMODE, ExifTagType::Short),
+    TagInfo(EXIF_WHITEBALANCE, ExifTagType::Short),
+    TagInfo(EXIF_DIGITALZOOMRATIO, ExifTagType::Rational),
     TagInfo(EXIF_IMAGEUNIQUEID, ExifTagType::Ascii),
     TagInfo(EXIF_BODYSERIALNUMBER, ExifTagType::Ascii),
     TagInfo(EXIF_LENSMAKE, ExifTagType::Utf8),
@@ -155,6 +175,8 @@ static const KnownTags staticGpsTagTypes = {
     TagInfo(GPS_LONGITUDE, ExifTagType::Rational),
     TagInfo(GPS_ALTITUDEREF, ExifTagType::Byte),
     TagInfo(GPS_ALTITUDE, ExifTagType::Rational),
+    TagInfo(GPS_SPEEDREF, ExifTagType::Ascii),
+    TagInfo(GPS_SPEED, ExifTagType::Rational),
     TagInfo(GPS_IMGDIRECTIONREF, ExifTagType::Ascii),
     TagInfo(GPS_IMGDIRECTION, ExifTagType::Rational)
 };
@@ -317,7 +339,7 @@ static void writeList(QDataStream &ds, const QVariant &value)
 inline qint32 rationalPrecision(double v)
 {
     v = qAbs(v);
-    return 8 - qBound(0, v < 1 ? 8 : int(std::log10(v)), 8);
+    return v < 1 ? 8 : 8 - qBound(0, int(std::log10(v)), 8);
 }
 
 template<class T>
@@ -884,7 +906,7 @@ QDateTime MicroExif::dateTime() const
     auto ofTag = exifString(EXIF_OFFSETTIME);
     if (dt.isValid() && !ofTag.isEmpty())
         dt.setTimeZone(QTimeZone::fromSecondsAheadOfUtc(timeOffset(ofTag) * 60));
-    return(dt);
+    return dt;
 }
 
 void MicroExif::setDateTime(const QDateTime &dt)
@@ -904,7 +926,7 @@ QDateTime MicroExif::dateTimeOriginal() const
     auto ofTag = exifString(EXIF_OFFSETTIMEORIGINAL);
     if (dt.isValid() && !ofTag.isEmpty())
         dt.setTimeZone(QTimeZone::fromSecondsAheadOfUtc(timeOffset(ofTag) * 60));
-    return(dt);
+    return dt;
 }
 
 void MicroExif::setDateTimeOriginal(const QDateTime &dt)
@@ -924,7 +946,7 @@ QDateTime MicroExif::dateTimeDigitized() const
     auto ofTag = exifString(EXIF_OFFSETTIMEDIGITIZED);
     if (dt.isValid() && !ofTag.isEmpty())
         dt.setTimeZone(QTimeZone::fromSecondsAheadOfUtc(timeOffset(ofTag) * 60));
-    return(dt);
+    return dt;
 }
 
 void MicroExif::setDateTimeDigitized(const QDateTime &dt)
@@ -966,6 +988,138 @@ void MicroExif::setUniqueId(const QUuid &uuid)
         setExifString(EXIF_IMAGEUNIQUEID, uuid.toString(QUuid::WithoutBraces).replace(QStringLiteral("-"), QString()));
 }
 
+double MicroExif::digitalZoomRatio() const
+{
+    if (!m_exifTags.contains(EXIF_DIGITALZOOMRATIO))
+        return qQNaN();
+    return m_exifTags.value(EXIF_DIGITALZOOMRATIO).toDouble();
+
+}
+
+void MicroExif::setDigitalZoomRatio(double zoom)
+{
+    if (qIsNaN(zoom))
+        m_exifTags.remove(EXIF_DIGITALZOOMRATIO);
+    else
+        m_exifTags.insert(EXIF_DIGITALZOOMRATIO, zoom);
+}
+
+quint16 MicroExif::isoSpeedRatings() const
+{
+    return quint16(m_exifTags.value(EXIF_ISOSPEEDRATINGS).toUInt());
+}
+
+void MicroExif::setIsoSpeedRatings(quint16 iso)
+{
+    if (iso == 0)
+        m_exifTags.remove(EXIF_ISOSPEEDRATINGS);
+    else
+        m_exifTags.insert(EXIF_ISOSPEEDRATINGS, iso);
+}
+
+ExposureMode MicroExif::exposureMode() const
+{
+    auto ok = false;
+    auto v = m_exifTags.value(EXIF_EXPOSUREMODE).toUInt(&ok);
+    return ok ? ExposureMode(v) : ExposureMode::NotSet;
+}
+
+void MicroExif::setExposureMode(const ExposureMode &em)
+{
+    if (em == ExposureMode::NotSet)
+        m_exifTags.remove(EXIF_EXPOSUREMODE);
+    else
+        m_exifTags.insert(EXIF_EXPOSUREMODE, quint16(em));
+}
+
+ExposureProgram MicroExif::exposureProgram() const
+{
+    auto ok = false;
+    auto v = m_exifTags.value(EXIF_EXPOSUREPROGRAM).toUInt(&ok);
+    return ok ? ExposureProgram(v) : ExposureProgram::NotSet;
+}
+
+void MicroExif::setExposureProgram(const ExposureProgram &ep)
+{
+    if (ep == ExposureProgram::NotSet)
+        m_exifTags.remove(EXIF_EXPOSUREPROGRAM);
+    else
+        m_exifTags.insert(EXIF_EXPOSUREPROGRAM, quint16(ep));
+}
+
+double MicroExif::exposureTime() const
+{
+    if (!m_exifTags.contains(EXIF_EXPOSURETIME))
+        return qQNaN();
+    return m_exifTags.value(EXIF_EXPOSURETIME).toDouble();
+}
+
+void MicroExif::setExposureTime(double et)
+{
+    if (qIsNaN(et))
+        m_exifTags.remove(EXIF_EXPOSURETIME);
+    else
+        m_exifTags.insert(EXIF_EXPOSURETIME, et);
+}
+
+double MicroExif::fNumber() const
+{
+    if (!m_exifTags.contains(EXIF_FNUMBER))
+        return qQNaN();
+    return m_exifTags.value(EXIF_FNUMBER).toDouble();
+}
+
+void MicroExif::setFNumber(double f)
+{
+    if (qIsNaN(f))
+        m_exifTags.remove(EXIF_FNUMBER);
+    else
+        m_exifTags.insert(EXIF_FNUMBER, f);
+}
+
+double MicroExif::focalLength() const
+{
+    if (!m_exifTags.contains(EXIF_FOCALLENGTH))
+        return qQNaN();
+    return m_exifTags.value(EXIF_FOCALLENGTH).toDouble();
+}
+
+void MicroExif::setFocalLength(double fl)
+{
+    if (qIsNaN(fl))
+        m_exifTags.remove(EXIF_FOCALLENGTH);
+    else
+        m_exifTags.insert(EXIF_FOCALLENGTH, fl);
+}
+
+FlashFlags MicroExif::flash() const
+{
+    return FlashFlags(m_exifTags.value(EXIF_FLASH).toUInt());
+}
+
+void MicroExif::setFlash(const FlashFlags &flash)
+{
+    if (flash == Flash::NotSet)
+        m_exifTags.remove(EXIF_FLASH);
+    else
+        m_exifTags.insert(EXIF_FLASH, quint16(flash));
+}
+
+WhiteBalance MicroExif::whiteBalance() const
+{
+    auto ok = false;
+    auto v = m_exifTags.value(EXIF_WHITEBALANCE).toUInt(&ok);
+    return ok ? WhiteBalance(v) : WhiteBalance::NotSet;
+}
+
+void MicroExif::setWhiteBalance(const WhiteBalance &wb)
+{
+    if (wb == WhiteBalance::NotSet)
+        m_exifTags.remove(EXIF_WHITEBALANCE);
+    else
+        m_exifTags.insert(EXIF_WHITEBALANCE, quint16(wb));
+}
+
 double MicroExif::latitude() const
 {
     auto ref = gpsString(GPS_LATITUDEREF).toUpper();
@@ -1045,6 +1199,30 @@ void MicroExif::setAltitude(double meters)
     m_gpsTags.insert(GPS_ALTITUDE, meters);
 }
 
+double MicroExif::imageSpeed() const
+{
+    if (!m_gpsTags.contains(GPS_SPEED))
+        return qQNaN();
+    auto ref = gpsString(GPS_SPEEDREF).toUpper();
+    auto speed = m_gpsTags.value(GPS_SPEED).toDouble();
+    if (ref == QStringLiteral("M"))
+        speed *= 1.60934;
+    else if (ref == QStringLiteral("N"))
+        speed *= 1.852;
+    return speed;
+}
+
+void MicroExif::setImageSpeed(double kmh)
+{
+    if (qIsNaN(kmh)) {
+        m_gpsTags.remove(GPS_SPEEDREF);
+        m_gpsTags.remove(GPS_SPEED);
+        return;
+    }
+    m_gpsTags.insert(GPS_SPEEDREF, QStringLiteral("K"));
+    m_gpsTags.insert(GPS_SPEED, kmh);
+}
+
 double MicroExif::imageDirection(bool *isMagnetic) const
 {
     auto tmp = false;
@@ -1191,6 +1369,58 @@ void MicroExif::updateImageMetadata(QImage &targetImage, bool replaceExisting) c
         if (!qIsNaN(v))
             targetImage.setText(QStringLiteral(META_KEY_DIRECTION), QStringLiteral("%1").arg(v, 0, 'g', 9));
     }
+    if (replaceExisting || targetImage.text(QStringLiteral(META_KEY_SPEED)).isEmpty()) {
+        auto v = imageSpeed();
+        if (!qIsNaN(v))
+            targetImage.setText(QStringLiteral(META_KEY_SPEED), QStringLiteral("%1").arg(v, 0, 'g', 9));
+    }
+
+    // shot info
+    if (replaceExisting || targetImage.text(QStringLiteral(META_KEY_DIGITALZOOMRATIO)).isEmpty()) {
+        auto v = digitalZoomRatio();
+        if (!qIsNaN(v))
+            targetImage.setText(QStringLiteral(META_KEY_DIGITALZOOMRATIO), QStringLiteral("%1").arg(v, 0, 'g', 9));
+    }
+    if (replaceExisting || targetImage.text(QStringLiteral(META_KEY_EXPOSUREMODE)).isEmpty()) {
+        auto v = exposureMode();
+        if (v != ExposureMode::NotSet)
+            targetImage.setText(QStringLiteral(META_KEY_EXPOSUREMODE), QStringLiteral("%1").arg(quint16(v)));
+    }
+    if (replaceExisting || targetImage.text(QStringLiteral(META_KEY_EXPOSUREPROGRAM)).isEmpty()) {
+        auto v = exposureProgram();
+        if (v != ExposureProgram::NotSet)
+            targetImage.setText(QStringLiteral(META_KEY_EXPOSUREPROGRAM), QStringLiteral("%1").arg(quint16(v)));
+    }
+    if (replaceExisting || targetImage.text(QStringLiteral(META_KEY_EXPOSURETIME)).isEmpty()) {
+        auto v = exposureTime();
+        if (!qIsNaN(v))
+            targetImage.setText(QStringLiteral(META_KEY_EXPOSURETIME), QStringLiteral("%1").arg(v, 0, 'g', 9));
+    }
+    if (replaceExisting || targetImage.text(QStringLiteral(META_KEY_FLASH)).isEmpty()) {
+        auto v = flash();
+        if (v != Flash::NotSet)
+            targetImage.setText(QStringLiteral(META_KEY_FLASH), QStringLiteral("%1").arg(quint16(v)));
+    }
+    if (replaceExisting || targetImage.text(QStringLiteral(META_KEY_FNUMBER)).isEmpty()) {
+        auto v = fNumber();
+        if (!qIsNaN(v))
+            targetImage.setText(QStringLiteral(META_KEY_FNUMBER), QStringLiteral("%1").arg(v, 0, 'g', 9));
+    }
+    if (replaceExisting || targetImage.text(QStringLiteral(META_KEY_FOCALLENGTH)).isEmpty()) {
+        auto v = focalLength();
+        if (!qIsNaN(v))
+            targetImage.setText(QStringLiteral(META_KEY_FOCALLENGTH), QStringLiteral("%1").arg(v, 0, 'g', 9));
+    }
+    if (replaceExisting || targetImage.text(QStringLiteral(META_KEY_ISOSPEEDRATINGS)).isEmpty()) {
+        auto v = isoSpeedRatings();
+        if (v != 0)
+            targetImage.setText(QStringLiteral(META_KEY_ISOSPEEDRATINGS), QStringLiteral("%1").arg(v));
+    }
+    if (replaceExisting || targetImage.text(QStringLiteral(META_KEY_WHITEBALANCE)).isEmpty()) {
+        auto v = whiteBalance();
+        if (v != WhiteBalance::NotSet)
+            targetImage.setText(QStringLiteral(META_KEY_WHITEBALANCE), QStringLiteral("%1").arg(quint16(v)));
+    }
 }
 
 bool MicroExif::updateImageResolution(QImage &targetImage)
@@ -1217,7 +1447,7 @@ MicroExif MicroExif::fromByteArray(const QByteArray &ba, bool searchHeader)
             idx = std::min(idxLE, idxBE);
         else
             idx = idxLE > -1 ? idxLE : idxBE;
-        if(idx > 0)
+        if (idx > 0)
             ba0 = ba0.mid(idx);
     }
     QBuffer buf;
@@ -1308,7 +1538,7 @@ MicroExif MicroExif::fromImage(const QImage &image)
         dt = QDateTime::currentDateTime();
     exif.setDateTimeOriginal(dt);
 
-    // GPS Info
+    // GPS info
     auto ok = false;
     auto alt = image.text(QStringLiteral(META_KEY_ALTITUDE)).toDouble(&ok);
     if (ok)
@@ -1322,6 +1552,38 @@ MicroExif MicroExif::fromImage(const QImage &image)
     auto dir = image.text(QStringLiteral(META_KEY_DIRECTION)).toDouble(&ok);
     if (ok)
         exif.setImageDirection(dir);
+    auto spd = image.text(QStringLiteral(META_KEY_SPEED)).toDouble(&ok);
+    if (ok)
+        exif.setImageSpeed(spd);
+
+    // EXIF shot info
+    auto zoom = image.text(QStringLiteral(META_KEY_DIGITALZOOMRATIO)).toDouble(&ok);
+    if (ok)
+        exif.setDigitalZoomRatio(zoom);
+    auto expm = image.text(QStringLiteral(META_KEY_EXPOSUREMODE)).toUShort(&ok);
+    if (ok)
+        exif.setExposureMode(ExposureMode(expm));
+    auto expp = image.text(QStringLiteral(META_KEY_EXPOSUREPROGRAM)).toUShort(&ok);
+    if (ok)
+        exif.setExposureProgram(ExposureProgram(expp));
+    auto expt = image.text(QStringLiteral(META_KEY_EXPOSURETIME)).toDouble(&ok);
+    if (ok)
+        exif.setExposureTime(expt);
+    auto flsh = image.text(QStringLiteral(META_KEY_FLASH)).toUShort(&ok);
+    if (ok)
+        exif.setFlash(FlashFlags(flsh));
+    auto fnum = image.text(QStringLiteral(META_KEY_FNUMBER)).toDouble(&ok);
+    if (ok)
+        exif.setFNumber(fnum);
+    auto flen = image.text(QStringLiteral(META_KEY_FOCALLENGTH)).toDouble(&ok);
+    if (ok)
+        exif.setFocalLength(flen);
+    auto isos = image.text(QStringLiteral(META_KEY_ISOSPEEDRATINGS)).toUShort(&ok);
+    if (ok)
+        exif.setIsoSpeedRatings(isos);
+    auto whtb = image.text(QStringLiteral(META_KEY_WHITEBALANCE)).toUShort(&ok);
+    if (ok)
+        exif.setWhiteBalance(WhiteBalance(whtb));
 
     return exif;
 }

src/imageformats/microexif_p.h

@@ -24,6 +24,85 @@
 #define EXIF_DEFAULT_BYTEORDER QDataStream::BigEndian
 #endif
 
+/*!
+     * \brief The Flash enum
+     */
+enum class Flash : quint16 {
+    NotSet = 0,
+
+    // Values for bit 0 indicating whether the flash fired.
+    // 0b = Flash did not fire.
+    // 1b = Flash fired.
+    Fired = 1,
+
+    // Values for bits 1 and 2 indicating the status of returned light.
+    // 00b = No strobe return detection function
+    // 01b = reserved
+    // 10b = Strobe return light not detected.
+    // 11b = Strobe return light detected.
+    ReturnLightNotDetected = 2 << 1,
+    ReturnLightDetected = 3 << 1,
+
+    // Values for bits 3 and 4 indicating the camera's flash mode.
+    // 00b = unknown
+    // 01b = Compulsory flash firing
+    // 10b = Compulsory flash suppression
+    // 11b = Auto mode
+    CompulsoryFiring = 1 << 3,
+    CompulsorySuppression = 2 << 3,
+    AutoMode = 3 << 3,
+
+    // Values for bit 5 indicating the presence of a flash function.
+    // 0b = Flash function present
+    // 1b = No flash function
+    FlashNotAvailable = 1 << 5,
+
+    // Values for bit 6 indicating the camera's red-eye mode.
+    // 0b = No red-eye reduction mode or unknown
+    // 1b = Red-eye reduction supported
+    RedEyeReductionSupported = 1 << 6,
+};
+Q_DECLARE_FLAGS(FlashFlags, Flash)
+Q_DECLARE_OPERATORS_FOR_FLAGS(FlashFlags)
+
+/*!
+     * \brief The ExposureMode enum
+     */
+enum class ExposureMode : quint16 {
+    Auto,
+    Manual,
+    AutoBracket,
+
+    NotSet = 65535
+};
+
+/*!
+     * \brief The ExposureProgram enum
+     */
+enum class ExposureProgram : quint16 {
+    NotDefined,
+    Manual,
+    Normal,
+    AperturePriority,
+    ShutterPriority,
+    Creative,
+    Action,
+    PortraitMode,
+    LandscapeMode,
+
+    NotSet = 65535
+};
+
+/*!
+     * \brief The WhiteBalance enum
+     */
+enum class WhiteBalance : quint16 {
+    Auto,
+    Manual,
+
+    NotSet = 65535
+};
+
 /*!
  * \brief The MicroExif class
  * Class to extract / write minimal EXIF data (e.g. resolution, rotation,
@@ -236,6 +315,69 @@ public:
     QUuid uniqueId() const;
     void setUniqueId(const QUuid &uuid);
 
+    /*!
+     * \brief digitalZoomRatio
+     * \return The digital zoom ratio when the image was shot or NaN if not set.
+     */
+    double digitalZoomRatio() const;
+    void setDigitalZoomRatio(double zoom);
+
+    /*!
+     * \brief exposureMode
+     * \return The exposure mode set when the image was shot. In auto-bracketing mode, the camera shoots a series of frames of the same scene at different exposure settings.
+     */
+    ExposureMode exposureMode() const;
+    void setExposureMode(const ExposureMode& em);
+
+    /*!
+     * \brief exposureProgram
+     * \return The class of the program used by the camera to set exposure when the picture is taken.
+     */
+    ExposureProgram exposureProgram() const;
+    void setExposureProgram(const ExposureProgram& ep);
+
+    /*!
+     * \brief exposureTime
+     * \return Exposure time, given in seconds (sec) or NaN if not set.
+     */
+    double exposureTime() const;
+    void setExposureTime(double et);
+
+    /*!
+     * \brief fNumber
+     * \return The F number or NaN if not set.
+     */
+    double fNumber() const;
+    void setFNumber(double f);
+
+    /*!
+     * \brief focalLength
+     * \return The actual focal length of the lens, in mm.
+     */
+    double focalLength() const;
+    void setFocalLength(double fl);
+
+    /*!
+     * \brief flash
+     * \return The status of flash when the image was shot.
+     */
+    FlashFlags flash() const;
+    void setFlash(const FlashFlags& flash);
+
+    /*!
+     * \brief isoSpeedRatings
+     * \return The sensitivity of the camera or input device when the image was shot.
+     */
+    quint16 isoSpeedRatings() const;
+    void setIsoSpeedRatings(quint16 iso);
+
+    /*!
+     * \brief whiteBalance
+     * \return The white balance mode set when the image was shot.
+     */
+    WhiteBalance whiteBalance() const;
+    void setWhiteBalance(const WhiteBalance& wb);
+
     /*!
      * \brief latitude
      * \return Floating-point number indicating the latitude in degrees north of the equator (e.g. 27.717) or NaN if not set.
@@ -258,6 +400,13 @@ public:
     double altitude() const;
     void setAltitude(double meters);
 
+    /*!
+     * \brief imageSpeed
+     * \return The speed in Km/h or NaN if not set.
+     */
+    double imageSpeed() const;
+    void setImageSpeed(double kmh);
+
     /*!
      * \brief imageDirection
      * \param isMagnetic Set to true if the direction is relative to magnetic north, false if it is relative to true north. Leave nullptr if is not of interest.

src/imageformats/util_p.h

@@ -34,10 +34,22 @@
 #define META_KEY_MODIFICATIONDATE "ModificationDate"
 #define META_KEY_OWNER "Owner"
 #define META_KEY_SOFTWARE "Software"
+#define META_KEY_SPEED "Speed"
 #define META_KEY_TITLE "Title"
 #define META_KEY_XML_GIMP "XML:org.gimp.xml"
 #define META_KEY_XMP_ADOBE "XML:com.adobe.xmp"
 
+// Shot info metadata keys
+#define META_KEY_DIGITALZOOMRATIO "DigitalZoomRatio"
+#define META_KEY_EXPOSUREMODE "ExposureMode"
+#define META_KEY_EXPOSUREPROGRAM "ExposureProgram"
+#define META_KEY_EXPOSURETIME "ExposureTime"
+#define META_KEY_FLASH "Flash"
+#define META_KEY_FNUMBER "FNumber"
+#define META_KEY_FOCALLENGTH "FocalLength"
+#define META_KEY_ISOSPEEDRATINGS "ISOSpeedRatings"
+#define META_KEY_WHITEBALANCE "WhiteBalance"
+
 // Camera info metadata keys
 #define META_KEY_MANUFACTURER "Manufacturer"
 #define META_KEY_MODEL "Model"