Re: bug with Overlay

Paul Geraskin <paul_geraskin@xxxxxxx> · Wed, 04 Apr 2012 12:47:36 +0400



    Hi! Thanks for answering.

    
     I agreed about interpolation. But as I said in my video 3dCoat is
    fully compatible with PHOTOSHOP. So, Overlay method works exactly as
    in photoshop, because it's a standard of CG industry. 

     You already did this with GEGK too. But I cannot save Gegl image.
    :(

    I cannot merge layers with Gegl interpolation and I cannot save to
    PNG/JPG with Gegl interpolation. This is the main problem.

    
    I did another comparison with photoshop and Gimp:

    http://i.imgur.com/qdesF.png

    
    On 04/04/2012 04:11 AM, gespertino@xxxxxxxxx wrote:
    
      2012/4/3 Paul Geraskin <paul_geraskin@xxxxxxx>

        
          Hi!

            
            I found a bug with Overlay and Gegl:

          
      I don't think it's a bug.

      As far as I can tell, that's because the 3D program where you
      created your multilayered file does layer blending in linear space
      and GIMP with GEGL off does it in gamma-corrected space.

      When "use GEGL" is selected, GIMP does the layer blending in
      linear space too, then you get similar results in both
      applications.

      Some blending modes like overlay look very different in linear and
      non-linear space.

      I'm not 100% sure, but it looks exactly like that.

    
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