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| PNG vs JPG color off by 1 |
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Posted by: af_luther - 06-16-2021, 11:08 PM - Forum: General questions
- Replies (7)
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I am automating a process in Python and I am loading a PSD into GIMP, changing a fill layer's color, and then exporting the result to JPG and PNG.
I am setting the fill layer to a light grey #3F3F3F (63,63,63). e.g. with
Quote:gimp_color = gimpcolor.RGB(int(rgb[0]), int(rgb[1]), int(rgb[2]))
pdb.gimp_context_set_foreground(gimp_color)
mylayer.fill(FILL_FOREGROUND)
The JPG output has that same color as expected (#3F3F3F).
The PNG output has changed that area to #3E3E3E (62,62,62).
Some other color areas I set are also off by 1 in the PNG, but not the JPG. Out of 6 different fill layers, 4 are correct and 2 are off.
I would like to correct this. In fact, I was thinking PNG would be better because I do have some artifacts in the JPG where the compression changes things a bit and the PNG should be lossless.
I noticed these messages in the output which I thought might be related:
Quote:gimp_color_transform_new: using babl for 'sRGB IEC61966-2.1' -> 'GIMP built-in sRGB'
gimp_color_transform_new: using babl for 'GIMP built-in sRGB' -> 'sRGB IEC61966-2.1'
gimp_color_transform_new: using babl for 'sRGB IEC61966-2.1' -> 'GIMP built-in sRGB'
gimp_color_transform_new: using babl for 'GIMP built-in sRGB' -> 'sRGB IEC61966-2.1'
gimp_color_transform_new: using babl for 'GIMP built-in sRGB' -> 'sRGB IEC61966-2.1'
void gimp_gegl_convert_color_profile(GeglBuffer*, const GeglRectangle*, GimpColorProfile*, GeglBuffer*, const GeglRectangle*, GimpColorProfile*, GimpColorRenderingIntent, gboolean, GimpProgress*): converting buffer took 0.0109 seconds
Any tips on how I can avoid this issue of the color values in the PNG export being slightly off from what I set?
The two places I am seeing the "wrong" value in the PNG is (1) loading it into Paint.net and (2) in a WebGL shader that uses it as a texture. In both of those programs the values I am seeing are the same.
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| Fore-/Background Color tool very small |
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Posted by: Ced_ - 06-15-2021, 09:28 PM - Forum: General questions
- Replies (1)
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Hello, newbie here,
I was setting up Gimp and noticed that the Foreground- and Background Color tool (beneath the toolbox icons) is incredibly small for me.
Is there any way to increase it's size? I found nothing on google about that, just about the size of the toolbox icons.
I use an 1440p monitor. Could it have anything to do with that resolution? Altough, on my second monitor (1080p) the tool is even smaller.
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| How to adjust filling pattern |
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Posted by: snowforest - 06-14-2021, 11:50 AM - Forum: General questions
- Replies (2)
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If I want to apply gradient filling, it automatically starts from black and goes to white. But I do not want it to start from that dark. How can I adjust the start and finish colors of gradient fill? I see the box but it looks very complex and nothing happens no matter what I do and first of all the escape button doesnt work in gimp.
Once I am done with filling how do I get rid of dashed lines around the selected area? Escape button doesnt work
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| Some XCF and PNG exports are bloated |
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Posted by: GMP - 06-14-2021, 01:47 AM - Forum: General questions
- Replies (4)
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I'm using 2.10.24 Yesterday after importing 73 meg PNG file into GIMP the XCF file became really bloated - 698 meg and the PNG I exported from this was 397 meg. I think the reason this is occurring is sometimes some pics are too small so I need to scale the layer much higher, sometimes over 100,000 px. Does scaling increase the file size quite a bit?
When this occurs GIMP is super slow at saving the file or exporting a file. Recently when this happened I noticed that most of the files I've been creating lately, which are all similar faces swaps, are fairly small XCF files (5-100 meg) and small PNG's (1-35 meg) are created from the export.
I use Photo Gallery to view my pics and want them to be about the same size for a slide show. After I make changes in GIMP I always open the pic in PhotoWorks, which is a program with some time saving photo correction and altering tools. I then save as a PNG and I open it again in GIMP for final fixes.
As a temporary fix I used the Snipping Tool to create a new PNG file from the 397 meg and it's a small 682 KB PNG file - 500x smaller
I think the PNG file somehow got corrupted. Is there a way to fix a file that opens in GIMP but is corrupted in some way? or do I just need to use the Snipping Tool? Or can the export the scale the pic larger?
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