轉(zhuǎn)載自：http://renderingpipeline.com/2012/06/photoshop-blendmodi-glsl/

I once wrote a texturing tool in which you could paint on a 3D model on multiple layers. These layers were composing the final texture just as you know it from photoshop, complete with alpha, opacity slider and: blend modes. these blend modes are quite simple to implement and it can be useful to use the exact same modes as they are familiar to artists and it’s possible to prototype the final effects in PS (or even write importers and exporters to psd files). The hardest part actually was collecting all the formulas, so this is why I’m collecting them here once again:

I’m assuming the ‘lower’ color is stored in?base?and the ‘upper’ color is stored in?blend.

• multiply: result = base * blend;
• screen: result = vec4(1.0) - ((vec4(1.0) - blend) * (vec4(1.0) - base));
• darken: result = min( blend, base );
• lighten: result = max( blend, base );
• difference: result = abs( base - blend );
• negation: result = vec4(1.0) - abs( vec4(1.0) - base - blend );
• exclusion: result = base + blend - (2.0*base*blend);
• overlay: # per channel: if (base < 0.5) {result = 2.0 * base * blend; } else {result = vec4(1.0) - 2.0 * (vec4(1.0) - blend) * (vec4(1.0) - base); }
• hard light: # per channel: if (blend < 0.5) {result = 2.0 * base * blend; } else {result = vec4(1.0) - 2.0 * (vec4(1.0) - blend) * (vec4(1.0) - base); }
• soft light: # per channel: if (blend < 0.5) {result = 2.0 * base * blend + base*base - 2.0 * base*base*blend; } else {result = 2.0 * sqrt(base) * blend - sqrt(base) + 2.0 * base - 2.0 * base*blend; }
• dodge: result = base / (vec4(1.0) - blend);
• burn: result = vec4(1.0) - (vec4(1.0) - base) / blend;

Blending,?Code,?Fragment Shader,?Shader,?Tutorial

轉(zhuǎn)載于:https://www.cnblogs.com/java20130723/archive/2012/07/18/3212247.html

創(chuàng)作挑戰(zhàn)賽新人創(chuàng)作獎(jiǎng)勵(lì)來(lái)咯，堅(jiān)持創(chuàng)作打卡瓜分現(xiàn)金大獎(jiǎng)

總結(jié)

以上是生活随笔為你收集整理的Photoshop Blendmodi in GLSL的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問(wèn)題。

如果覺(jué)得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。