3 Commits

Author	SHA1	Message	Date
Mirco Miranda	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
Mirco Miranda	21211cd63b	psd: LAB conversion speed improved ... Using an approximated pow function improves the conversion speed of LAB images by more than 50% without an appreciable visual difference.	2023-01-27 23:19:48 +00:00
Mirco Miranda	d030c75925	PSD: LAB support ... LAB images support: - Added LAB 8/16-bits support by converting them to sRGB - The conversion are done using literature formulas (LAB -> XYZ -> sRGB): [sRGB on Wiki](https://en.wikipedia.org/wiki/SRGB), [LAB on wiki](https://en.wikipedia.org/wiki/CIELAB_color_space) - Removed unused code	2022-07-06 21:30:23 +00:00