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PSD files are saved with as alpha premultiplied. The problem is that alpha refers to white instead of black so it requires transformation formulas. Then, to conver PS premultiplied to QImage premultiplied you have to use the following formula: * V = Alpha + Vps - Max (C, M, Y, K, R, G, B, Gray, L\* components) * V = Vps + (Alpha - Max + 1) / 2 (a\*, b\* components) Where Max is the maximum value depending on the image depth and Vps is the valued read from the file. |
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KImageFormats
Plugins to allow QImage to support extra file formats.
Introduction
This framework provides additional image format plugins for QtGui. As such it is not required for the compilation of any other software, but may be a runtime requirement for Qt-based software to support certain image formats.
Formats
The following image formats have read-only support:
- Animated Windows cursors (ani)
- Gimp (xcf)
- OpenEXR (exr)
- Photoshop documents (psd, psb, pdd, psdt)
- Sun Raster (ras)
- Camera RAW images (arw, cr2, cr3, dcs, dng, ...)
The following image formats have read and write support:
- AV1 Image File Format (AVIF)
- Encapsulated PostScript (eps)
- High Efficiency Image File Format (heif). Can be enabled with the KIMAGEFORMATS_HEIF build option.
- JPEG XL (jxl)
- Personal Computer Exchange (pcx)
- SGI images (rgb, rgba, sgi, bw)
- Softimage PIC (pic)
- Targa (tga): supports more formats than Qt's version
- XView (xv)
Contributing
See the QImageIOPlugin documentation for information on how to write a new plugin.
The main difference between this framework and the qimageformats module of Qt is the license. As such, if you write an imageformat plugin and you are willing to sign the Qt Project contributor agreement, it may be better to submit the plugin directly to the Qt Project.
Note that the imageformat plugins provided by this module also provide a desktop file. This is for the benefit of KImageIO in the KDE4 Support framework.
Duplicated Plugins
The TGA plugin supports more formats than Qt's own TGA plugin; specifically, the one provided here supports indexed, greyscale and RLE images (types 1-3 and 9-11), while Qt's plugin only supports type 2 (RGB) files.
The code for this cannot be contributed upstream directly because of licensing. If anyone were willing to write fresh code to improve Qt's TGA plugin, it would allow the TGA plugin in this framework to be removed.
License
This framework is licensed under the LGPLv2.1.
The CMake code in this framework is licensed under the BSD license.