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| Blending colors to fill in white cut-out lines? |
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Posted by: Pier - 04-07-2023, 10:17 AM - Forum: General questions
- Replies (4)
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Hi all,
I've used GIMP in the past and have re-installed it to use it for creating a single photo where i inserted 1 cut-out image (as a layer) onto another image. The smaller image i have cut out has these white lines around it, which i would just like to blend in with the surrounding colors. I'm not really interested in making a better cut out, because the image that is cut out is very complex in shape. I would really just want to 'brush' the white line away. Is such a thing possible? I tried making a selection and using the feather tool, but this only makes the white marginally darker. I really just wanna extend the surrounding color into the white line if possible, or whatever solution. The image will just be used for a thumbnail, so doesn't have to be razor sharp at all in these details.
Thanks in advance!
attached is a zoomed-in shot of the inserted image and white line
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| lost function in GIMP |
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Posted by: kim653240 - 04-07-2023, 09:18 AM - Forum: General questions
- Replies (1)
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my GIMP suddenly not allowing me to export the works in whatever format other than the default format. The print function is also gone.
I've reinstall the program but it doesn't help
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| Can't save my work exactly as I need to! |
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Posted by: Limey39 - 04-06-2023, 02:10 AM - Forum: General questions
- Replies (3)
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I last used Gimp some years ago when I was doing some screen printing and at that time I had no problem saving my work in its finished form.
However, as a new user again after about an 8 year layoff, I find myself struggling to do what should be a most basic operation, saving my work in its completed form.
I have a graphic illustration from which I need to remove a solid color background. Having done so, then I can then set the foreground object in another design. I have had no problem with removing the background, but when I try to export it to my desktop in jpg format, it saves the file with a white background which is still present when I drop this image into my other design.
If anyone can tell me what I am doing wrong (if in fact I am), or what I might do to remedy this situation, I would be very grateful.
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| Pseudo-infrared |
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Posted by: Ofnuts - 04-05-2023, 12:15 PM - Forum: Tutorials and tips
- Replies (2)
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Explaining something I obtained something that looks like an IR photo, so here it is...
The initial question is about inverting luminosity while keeping the colors...
So:
- Put your image in a group (bottom group in screenshot below)
- Add a white layer below it
- Set the image layer to LCH Lightness mode
- The result of the group is a grayscale version of the image
- Layer > New from visible to "freeze" that result
- Color > Invert for a negative version
- Add a second group (top group in screenshot)
- Add a copy of your initial image in it
- Add the inverted layer above it in the group
- Set the inverted layer to LCH Lightness mode
Edit: there is even a way to avoid the New from visible (layer modes in parentheses when different from "Normal"):
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| For your panoramas: Xpano |
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Posted by: Ofnuts - 04-02-2023, 05:07 PM - Forum: Other graphics software
- Replies (11)
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Want to stitch pictures together? Try Xpano (Linux and WIndows version).
Very easy to use. From this:
To this(*):
... in matter of seconds. Only manual intervention: tweak the crop frame (but it automatically determines the biggest frame that fits the stitch, and can even auto-fill corners).
Only two downsides: install appears some what bulky, and JPEG are saved with quartered chroma (but you can saved to PNG).
(*) Image scaled down 50% to fit the forum's file size limits.
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| GIF frames deleting script. |
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Posted by: rey - 04-02-2023, 12:29 PM - Forum: Scripting questions
- Replies (9)
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I understand it's not polite to bluntly ask for anybody to make a script that i need, so hope asomebody can give hints on commands i must use to try to achieve my goal.
The goal is a a script that makes automatic deletion of GIF frames(layers) based on 2 parameters, and then exports file in original location adding some "copy"/"-01" to name. The deletion logic should work like "delete X frames after each Y frames".
For example:
= GIF with 22 frames, parameters are X=2 Y=3, after processing there will be: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
= GIF with 22 frames, parameters are X=1 Y=4, after processing there will be: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
[crossed frames are deleted]
Hope for your help.
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| What is anti-aliasing? |
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Posted by: Ofnuts - 04-01-2023, 04:41 PM - Forum: Tutorials and tips
- Replies (1)
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Anti-aliasing is the technique used to obtain lines that are both visually sharp and smooth.
If the smallest "drawable" units (in other words, the pixels) on our displays were smaller that our eyesight resolution, there would be no problem, but with the current display technology they are still somewhat visible, so anti-aliasing is how the problem is mitigated.
Assume that we have a pixel (the whole square) that straddles the edge of an object (red line):
In this pixel, 80% of the pixel is in the object (black), 20% is outside (white)
What should be the color of the pixel?
Well, things shouldn't change with scale, right? So, if we use a bigger object (so, more pixels) and step back so that the visual size is the same as before, the area of the initial pixel is now covered by black pixels and white pixels, where 80% of the pixels are black, and 20% are white (if we forget the pixels along the edge).
What is the color equivalent color? This is the color of an area where 80% of the pixels are black, so for instance this is the perceived color of this (from sufficiently far away):
Which is the same color as this (the image above, with Filters > Blur > Pixelize and a block size equal to the image size).
Note that the "perceptual" channel values of this color are not 20% (or around 50, if using the [0..255] notation), but close to 50% (or 127) because luminosity is not proportional to channel values, due to gamma correction.
And what happens if, instead of colors, we draw on a transparent background? In practice, the problem is very similar, because the transparency of pixels is computed in a very similar way (see the description of the "over" operator), so anti-aliasing uses partial opacity instead of a color blend.
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