phrozen / blend Goto Github PK

Vivid light algorithm (and hard mix because of that) does not produce the same effects as Adobe Photoshop CS 5. The vivid light algorithm used right now is working fine and it is not bugged, but produces slightly different results than PSD.

This is the only vivid light algorithm I have found so far. Need to keep checking.

Edit: GIMP does not have Vivid Light Layer Mode (or Hard Mix for that matter)

HUE blend mode produces the same effect on both Photoshop CS5 and GIMP. Current implementation reproduces both exactly.

SATURATION, COLOR, and LUMINOSITY blending modes have different implementations on Photoshop CS5 and GIMP. Current implementation of the library produces exactly the expected result from COLOR that GIMP uses and very similar results on SATURATION and LUMINOSITY. But the Photoshop CS5 algorithms have different results on all 3 of them.

To do:

• Match SATURATION and LUMINOSITY blend modes to the GIMP implementation, it may have to do with rgb to hsl transformations, maybe try different implementation (but... ¿why HUE and COLOR work as expected?).
• Find the correct Photoshop algorithms (if possible, ¿maybe reverse engineer them?) and implement them forking all functions that produce different results.

func getWidthAndHeight(img image.Image) (width, height int) {
width = img.Bounds().Max.X - img.Bounds().Min.X
height = img.Bounds().Max.Y - img.Bounds().Min.Y
return
}

you should use the Dx() for the width and Dy() for the height

func getWidthAndHeight(img image.Image) (width, height int) {
width = img.Bounds().Dx()
height = img.Bounds().Dy()
return
}

How to control the strength of the color burn algorithm

Implement tests