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Author SHA1 Message Date
Mirco MirandaandAlbert Astals Cid 402dfb5de3 psd: Fix alpha blending 
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.
 2023-03-29 17:55:55 +00:00
Gary Wang 938b8126b5 No longer descease color depth to 8 for 16 bit uncompressed PSD files 2020-11-10 13:03:37 +08:00
Gary Wang b742cb7cc7 Return unsupported when reading 16bit RLE compressed PSD files 2020-11-01 11:50:48 +08:00