3 Commits

Author	SHA1	Message	Date
Mirco Miranda	e96b43aef5	psd: Fix alpha blending (KF5) ... 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. This is a port of MR !143 to KF5.	2023-03-29 17:58:09 +00:00
Mirco Miranda	2997f7ae8d	psd: conversion speed improvements (kf5) ... - Improved performance converting CMYK files by \~10% by replacing divisions with multiplications. - Improved performance converting LAB files by \~50% by replacing std::pow with fastPow (approximated pow function).	2023-02-03 20:55:49 +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