I'm reading gimp Docs in gimp.org. There is an option called "Save background color" in exporting png file dialog. The Docs says like this.

If your image has many transparency levels, the Internet browsers that recognize only two levels, will use the background color of your
Toolbox instead. Internet Explorer up to version 6 did not use this information.

I tested with 3 layers of transparency. Then I chose the background color of the toolbox yellow. I saved it as png with the option, "Save background color", checked.

I opened the saved png file on firefox. However the opened png file doesn't show the background color, yellow. Why is that so?

I am already using gimp for years, not professionally, but I know most basics.
I also already used google to find proper solution, but all tutorials are not exactly about what I need, so please do not send me links about simple black n white or greyscale conversions.

What I need is to convert colored image to almost pure black n white effect with smooth curves.
I am not talking about greyscale with "desaturate" or 2 color with "threshold".

Original image in lossless PNG.
It has various colors that I want to remove, not making them greyscale.
https://speedstar.itos.pl/gimp/gimp-original.png


Method 1.
I use "threshold" with value 160, which is close to what I am looking for, but the problem is that it makes image pure 2 color, and all curves are not smooth, making no shades between black and white pixels (use pixel perfect zoom withot blurring filters if you are not sure what I am talking about).
https://speedstar.itos.pl/gimp/gimp-threshold_160.png


Method 2.
I use "desaturate" with "average" setting, make duplicate and set layer mode to "dodge", which keeps smooth curves and nicely removes most filling colors, but there are grey fogs that can be noticed on chest, upper leg, and shoe.
https://speedstar.itos.pl/gimp/gimp-desa..._dodge.png


Method 3.
I use "desaturate" with "average" setting, increase gamma (not brightness, because I do not want to touch black color) with "levels" with value 160, increase "contrast" to value 96 (127 makes image 2 color), but I am still getting grey fogs slightly on chest and noticeably on upper leg, and also some lines become too small.
https://speedstar.itos.pl/gimp/gimp-desa...ast_96.png


Method 4.
I use "color to alpha" on all colors, make duplicate and set layer mode to "dodge", which seems to to have better effect than previous methods, but I am still getting grey fogs that can be noticed on chest, and if I use another duplicate and set layer mode to "dodge", then lines become too small.
https://speedstar.itos.pl/gimp/gimp-all_..._dodge.png


Any ideas?
Thanks for any suggestions, and please, lets discuss it like intelligent adults, no useless comments, no childish behaviors.

I'm reading the gimp Docs in gimp.org. I can't understand this part.

If the quality setting found in the original file are not better than your default quality settings, then the option "Use quality settings from original image" will be available but not enabled.

What does "the option is available but not enabled" mean?

Thanks for reading.

Looking at some of the new tweaks in Gimp 2.10 and a non-photographic filter, Filters -> Map -> Panorama-Projection. (It is in Gimp 2.8 as a GEGL operation, but who ever looks there). An additional option Inverse-Transform

The dialogue looks like this, with nice on-canvas updating. WYSIWYG




Why am I writing about this not-very-often-used filter? You might have, once upon a time, used a Gimp plugin MathMap to produce similar results. Will MathMap still work in Gimp 2.10? Yes but you might have to do a little gentle hacking to provide the necessary library files that MathMap requires.

This in a Kubuntu 18 VM and Gimp 2.10 from otto-kesselgulasch/gimp-edge. The mini-planet filter.

I have a GIMP file that I created some time back. Fast forward to today, I am using a new computer which apparently doesn't have the font that I used in the design installed. When I open the GIMP file, the font is still applied within the design but it can't be edited and will not show the name of the font. Is there any way to identify the name of the font at this point?

Hello,

2 questions here.

How to rotate selection, be it custom or rectangle or circular?

How to easily draw ready shapes, like rectangle and circle? I haven't found them in the toolbox.

Thanks.

I have a gif which supposedly has an alpha channel. When I try loading it onto a site, it always shows an opaque black background. I would appreciate it if anyone could tell me what I'm doing wrong. Thanks.https://www.dropbox.com/s/wygkz0iqmqh0e2...2.gif?dl=0 

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Attached is a screenshot of what I'm looking at.  My avatar file has been chosen - but I don't know where to click next to upload it.  Clicking on the bottom button (Choose Avatar) brings me to a bad page.   Please help.

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I need to reduce a file size to 100kb - but don't know how.  Attached is the current information for that file:  Please help me with the procedure so I can save the reduced size file as a jpg.  Thank you.

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I am making a blank paintable map from a game's map that it uses to make the provinces in-game. I want to know how to make the border between all the different colours instead of individually selecting them and making a border.