Highlights:
- Adds support for a new palette changer chunk. Some test cases attached to #38 .
- Fixes the reading of ILBMs with the mask (test case: [cyclone.iff](/uploads/d8734d2155fd0d21f7b003b37e0d1259/cyclone.iff)).
- Adds support for HAM5 encoding.
- Adds more test cases created using [HAM Converter](http://mrsebe.bplaced.net/blog/wordpress/).
- Adds support for Atari STE RAST chunk outside FORM one (test case: [fish.iff](/uploads/c461cf4b6a1423cec60fbce645d9fd07/fish.iff)).
NOTE: I contacted Sebastiano Vigna, the author of the PCHG chunk specifications, and he provided me with:
- Some images to test the code (but I can't include them in the test cases).
- Permission to use [his code](https://vigna.di.unimi.it/amiga/PCHGLib.zip) without restrictions: Huffman decompression was achieved by converting `FastDecomp.a` via AI.
Closes#38
For example, the PCX plugin converts all RGB images to RGB(A)32. So if you try to save a 1 GiB RGB888 image, it will be converted to RGB32 image so, you need additional 1.25GiB of ram. The conversion now occurs line by line, significantly saving memory.
Adds TGA 2.0 compliance:
- Support for Extension Area, Developer Area and Footer (metadata support)
- Support for 15-bit and 16-bit per pixel images (both RGB and Indexed)
- Full support for rotation on reading (we cannot use Qt transformations because only a subset is part of the TGA specification)
- When writing you can choose the supported version (subType)
- Improved writing speed (approximately 10 times) and removed whole image conversions (significant memory savings)
It pass the [TrueVision TGA 2.0 conformance suite](https://github.com/zigimg/test-suite/tree/master/fixtures/tga).
Test changes:
- Read test: added ability to skip a specific test on sequential devices (via JSON behavior file)
- Write test: added the ability to set the subType when writing (via JSON properties file)
Closes#37
- Removed temporary buffer of uncompressed image size when reading (loads images using half the memory)
- Added native support for Grayscale images (they are no longer converted to RGB(A) 32 when reading/writing)
- Fixes wrong X channel value on RGBX32 images (CCBUG: 499584)
It should also reduce loading times for corrupted images.
Closes#33
Add the following features:
- RGB8 image data support (test case added)
- RGBN image data support ([Clouds.iff](/uploads/9db869350f74421bf1813fa7d4332f4f/Clouds.iff))
- CAT chunk support: you can have more than one image for file (test case added)
- Image transformation support via EXIF data
[RGBN/RGB8](https://wiki.amigaos.net/wiki/RGBN_and_RGB8_IFF_Image_Data) files are used in Impulse's Turbo Silver and Imagine.
Closes#34
Read-only support for most common Interchange Format Files (IFF). Supports IFF saved by Photoshop for the Amiga and Maya platform and HAM6 coded files.
Closes#29
EXIF specs V3 added the UTF-8 data type. The MicroExif class now allows serializations to choose whether to support the V2 or V3 format. To maximize compatibility with old readers, even when V3 is set, the ASCII data type is used if possible.
The JXR plugin, based on TIFF V6 container, does not allow to use the V3 format (it does not recognize the UTF-8 data type) and therefore V2 has been forced. For all other plugins using MicroExif, it is now possible to save, e.g., descriptions in Japanese.
Please note that this patch is also a bugfix: when saving, version 3 was set but the strings were always saved as ASCII.
- Full rotation support on load and save.
- Improve also Windows compatibility by converting RGB32 to BGR32 on saving
Images saved with orientation are displayed correctly by Windows Explorer (which natively supports JXR files):
{width=597 height=259}
Improved metadata support via EXIF metadata. Since JXR is based on a TIFF container, EXIF data is read directly from the file so it always works (even with versions of libjxr that don't have the metadata reading API).
It also solves the following issues:
- Incorrect date format on saved JXR files (was saved in ISO format instead of `yyyy:MM:dd HH:mm:ss`).
- Incorrect date type setting in EXIF data: the `DateTime` tag should be updated on every save (verified by GIMP and Photoshop). Our `CreationDate` metadata is the equivalent of the EXIF `DateTimeOriginal` tag.
Closes#22
Allow to load/save info about:
- GPS info (latitude, longitude, altitude)
- Various text info (title, description, author, copyright, etc...)
- Image resolution
The compatibility of the modifications has been tested with GIMP.
Added a new parameter to the read tests called `perceptive-fuzz`.
The parameter, when active, modifies the fuzziness value based on the alpha value of the pixel. The more transparent the pixel, the more the fuzziness value increases.
We have found that some image manipulation functions give different results depending on the architecture (we think it is differences in rounding). These differences can become problematic with small alpha values when there are several image conversions from normal alpha to premultiplied alpha (and vice versa).
In particular, the offending plugin is XCF.
The parameter should be set if and only if necessary. CMakeList has not been modified to allow it to be enabled on all format images (you can still try it from the command line). To use it, you need to set it in the JSON file of the image that has problems (after careful analysis).
More info about the issue on #18
This MR also fixes a bug in `fazzeq()`: it only compared 1/4 of the image.
Below is the same XCF image rendered on AMD64 and PowerPC:
- AMD64:
- PowerPC:
The image is visually the same because the differences are with very low alpha and therefore are negligible. The patch proposed with this MR is useful in these cases.
Added support for the following options:
- `ImageTransformation`: uses EXIF data (same behaviour of Photoshop and GIMP)
- `Description`: uses EXIF data
- `ImageFormat`
Closes#17
