GIMP :: Controlling Color Of Transparent Pixels?
Jun 30, 2012
How can I control the color of transparent pixels?
I save my image in RGBA (Windows bitmap). The RGB value of the completely transparent areas always turn completely black, and I want to control the color myself.
It may seem pointless, as the color is transparent, but I am using the image elsewhere (for creating mipmaps) where there is interpolation between pixels. Interpolating between 0 and 1 in opacity gives 50%, but the RGB part of the interpolation will mix with black, giving a dark halo.
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Feb 12, 2013
I opened a transparent PNG and exported the PNG to another file and unchecked 'save color values from transparent pixels' but about 20% of the color values in transparent pixels STILL remain in the picture when viewed in other programs that show those pixels!!! Gimp is NOT removing ALL color values in transparent pixels!
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Sep 26, 2013
How can I convert all of the transparent (100% transparent) pixels in an image to a specific color?
Adding a color layer below is not the solution I'm looking for, because some pixels are partially transparent and I don't want to modify those ones.
I use the "select color range" feature alot to do things with specific color pixels, but that feature doesn't seem to work in this case.
I am creating bitmap images for a program, where the transparent parts of the image need to be represented by a specific color.
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Mar 16, 2009
I have an image that has corners with partially transparent pixels. I would like to make a mouse-over image of this with the same same dimensions, only a different color.
How can I color this image a different color and still have the partially transparent pixels around the edge. Obviously, I would like the semi-transparent pixels to be semi-transparent of the new color.
I'm still not allowed to use the link vb, but let's try this: ....
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Mar 16, 2009
I have an image that has corners with partially transparent pixels. I would like to make a mouse-over image of this with the same same dimensions, only a different color.
How can I color this image a different color and still have the partially transparent pixels around the edge. Obviously, I would like the semi-transparent pixels to be semi-transparent of the new color.
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Nov 13, 2012
so under edit pref and input controllers. I edited the scroll button of the mouse to have zoom in and out. works like a charm. Now, i have seleted to edit the ctrl+scroll up and down features to change brush size. Problem is, it works great right after i have selected the brush and type of tool i want, but as soon as i paint on the image and then hit the ctrl button, it now displays the another tool and i think its the color picker. I try to also scroll the mouse wheel and nothin.
I cant seem to find the option that is controlling the color picker or whatever that tool is to come up when the i hit ctrl. I even searched for color picker under keyboard shortcuts.
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Mar 5, 2013
I have been using Gimp for a lot of "tile based" images, which feature layers composed of several "tiles" pasted into those layers. However, I just recently started creating transparent tiles, and pasting them.
One of the strangest things I have run into here is that I don't seem to be able to move my selection ( Floating Layer? ) if the opacity on the source pixels is 0.25 or less. Specifically, I do not get the usual "drag box" when I hover over the transparent pixels. Instead, I get the "anchor box" ( which seems to crop the pasted area before anchoring ). I tried this on a composite image with some more transparent pixels ( 0.25 ) and some more opaque pixels ( 0.26 ), and the "drag box" appears only over the more opaque pixels.
Why this might be happening? It could be that this is just context-sensitive cursor behavior which varies on transparency, and if so, is there another way to move the pasted selection?
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Oct 13, 2012
Whenever I have a selection in an image, I can move it around all I want and wherever I want until I anchor it, but when I open that same image again after saving it and then select a part of the image, I can't get my selection to move. Rather the entire image moves and leaves transparent pixels. How do I move selections and not whole images without leaving transparent pixels?
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Oct 25, 2012
I have an image with an transparent background. I want to change all pixels that are not the background to one color. How do I do this? I can't select the pixels, they as arbitrariliy distibuted. I've played with threshold, but that's not working either. I tried Image-->Mode -> Indexed and then Use black and white palette, but that doesn't work either. I thought i would convert all non-transparent values to black, but instead its picking some threshold and making some black and others transparent. Example file attached.
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Sep 13, 2012
I had a .JPEG of a leaf photographed against a white background. When I went to turn that white background into a transparent alpha channel, it seemed to work okay....except for the fact that when I then went to select the new alpha channel via the Fuzzy Select Tool, it wasn't selecting all these newly transparent pixels.
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Mar 28, 2012
I was using Paint.net but I've found it too limited. The GIMP has much more power and I can do a lot more with it, but I've found a few things I can't figure out how to do.
For example, when I use the Eyedropper tool () to choose a color, GIMP doesn't seem to include any transparency in the selection:
The Colorpicker just chooses the color at 100% opacity. Is there any way to change this so that my new foreground color includes the transparency level?
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Apr 7, 2012
How can I find all pixels in an image with an exact, specific color? So far, I've only managed to find the pixels matching a pixel I click on; but I wish to find pixels matching a specific color value!
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Mar 31, 2012
step 1) I remove the background of my image with the color to alpha method, isolating the part of the image i want.
step 2) I then use color select tool to select all the transparent area that was left behind from step 1.
step 3) I create a new layer.
step 4) Then I use the bucket fill tool to fill in the area on the 2nd layer that was selected in step 2.
This is where I run into trouble. On some pixels where the color filling meets dotted line area (made by color select tool) the color comes out translucent. I don't want this to happen. I want it to be solid ff00ff (color hex) without the random reductions in opacity.
I'm working with sprites and the emulator i use has ff00ff as transparent. I'm getting random pink color coming out of the edges of my sprites. These little specks of pink should not be appearing in game because it is supposed to be read as transparent. i suspect that these specks coming out are related to these translucent hiccups made in gimp.
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Oct 15, 2012
2 days on GIMP. I need to adjust the clone tool so it's 1080 pixels vertical and about 20 pixels wide. I googled and searched, but I can't seem to find the right phrasing.
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Jan 2, 2012
I have an image that I want to paste a question mark over. I found this clipart question mark. I would like to fill in the regions of the symbol with grey translucent color.
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Nov 19, 2012
I have been working on colorization, by putting a transparent B&W image over the color background, all is good apart from when I do people and just want to show their eyes in color. Allot of the times eye color comes out wrong, for instance, when I did my daughter her eyes are blue but color came out brown eyes.
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Dec 26, 2011
I have a jpeg image of a motorcycle on a pure yellow background. I want to make the yellow transparent. Naturally there are a lot of spaces within the motorcycle image that contain yellow.
I followed instructions I found...
Removing the background of an image
1) add an alpha channel to your layer
2) use colors/color to alpha and use the background color
This results in the checkerboard being applied to the motorcycle, not the yellow background. I assume that's okay.
This makes all the pixels with the background color transparent, and those with a close color partially transparent.
Then:
- select the background with the magic wand,
- grow the selection by a couple of pixels to ensure that the border of the sprite is in the selection (the most important work of color-to-alpha is on the border pixels, so they shouldn't be protected)
This selects only the area outside the bicycle, but I don't mind reselecting smaller areas, if I can.
- grow the selection by a couple of pixels to ensure that the border is in the selection (the most important work of color-to-alpha is on the border pixels, so they shouldn't be protected)
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Mar 16, 2013
How to change the color of an icon (ex: from black to grey). My problem is that the end result is sometimes an icon that is partially transparent.
Here is what I am doing:
1) I open the image of which I want to change the color (black icon over transparent background)
2) Create a new layer and color this in white.
3) Merge the two layers
4) Create a new layer and color this with the color I want for my icon
5) Go to Colors -> Color to Alpha
6) Select the current color of the icon
7) Click Ok - Now icon color is the wanted color over a white background
8) Create a new layer and leave this transparent
9) Go to Colors -> Color to Alpha
10) Select the white color (current background color).
11) Click Ok - Now icon background is transparent, but icon color is also partially transparent.
Is there a way how I can change the color of an icon without getting the icon color transparent.
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Jun 26, 2011
as you can see I was able to make the background transparent by 'select by color' + 'add alpha channel' + 'remove selected area' but I also need to remove the white behind the 50% opaque reddish orange flames as well, i cannot select the white by 'select by color' or 'magic wand select' or any of the selection tools because of the issues of the white / reddish orange mix of opacity, so I need removing this white behind the part opacity color.
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Dec 27, 2012
exported transparent png fiiles get this rainbow of color distorted bleed when previewing or importing into programs that cannot read the png's transparency!!! even program that can read the png's transparency after you check a 'make transparent' checkbox (such as Memorex Expressit label design studio) have this distorted color bleed!! like in the label program checking 'make transparent' leaves the rainbow color distortion in!!!
this seems to be ONLY happening with Gimp exported PNGs!!! other PNGs and other programs that can generate transparent PNGs don't have this issue!
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Apr 20, 2012
There seems to be tons of threads on how to make a transparent image, but I haven't been able to fine one to do one specific thing.
How do I set the alpha channel to be black? I want to have a black background on a png file, but I need the black to be transparent to things behind it on a webpage.
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May 7, 2013
I would like to delete all transparent pixels surrounding my irregularly (non-square) image. The TRIM function only trims to a square surrounding my image and not to the edge of the image itself. Is there a work around for this? I have looked around and haven't found one.
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Oct 1, 2011
I have an image (of many layers) which are mostly solid color, and solid alpha. 1-bit alpha, which is exactly what i want. However there are a few parts which are slightly blurry, where it fades between the two. this is causing problems in my end result. The common white halo effect.
I've tried the flaming pear solidify plugin, and it's totally not what i want. I don't want to fill everything with color or mess around with alpha channels. What i want to do is convert all partially transparent pixels, to either 0 or 100% alpha, with no middle ground. Essentially to make the image alpha binary. ideally some plugin which lets me define the threshold for one or the other would be nice.
I'm saving as an 8bit png, which naturally forces everything to be 1-bit alpha. this is unfortunately resulting in a lot of pixels being white where they show as almost invisible in Photoshop, so i want to fix this problem author side. Ideally i'd like to not mess around with alpha channels - i like the png format because i never have to touch the alpha channel, it's all done for me which speeds up workflow dramatically. I know i can save as a 24 bit png which will store the partial alpha information, but this also increases file size which is not an acceptable compromise for my purpose.
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May 8, 2008
I'm interested in doing a non-destructive "resize" of an image, whereby only the transparent pixels are traditionally resized and the non-transparent pixels remain the same size (but move relative to the resized transparent pixels).
As an example, imagine an image that consists of stars on a transparent background. If we were to do the above to this image, the physical space taken up by the image would increase (due to the resizing of the transparent pixels), but the stars themselves would remain the same size. In short, the stars would appear to spread out to fill more space.
If it helps, here's an illustrated example: ....
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Feb 18, 2013
I need to know how to make these pixels in the picture go away. I tried making the background black but It makes it look ugly. Is thier an eaiser way to do this?
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Feb 19, 2013
How do I make pixels transparent? I've looked all over Youtube and the internet, but I couldn't find any tutorials for this version,
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Nov 17, 2011
Is there a way to control the color of a field region when it is exported to Autocad? I believe the boundary of the field region dictates the color of the filled region when exported to Autocad. Is there any way to override this?
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Aug 19, 2013
I have two layers and some of the pixels in each layer are the same. I want the difference on the pixels that are not the same and for the pixels that are the same I want the result to be a transparent pixel. I have tried using the difference blend node but for pixels that are the same it returns black as the result not transparent.
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Jun 4, 2012
I'm making graphics for a 2D game. One important part of performance optimisation is getting rid of unnecessary alpha sorting. I don't want partial alpha unless i have a specific need for it. I'm wanting all my images to be 1-bit alpha only. That is, a pixel is either completely opaque, or completely transparent - never inbetween.
I'm not sure how to do this easily in photoshop. So far i've come up with a workflow that fills my needs pretty well, except that it seems unnecessarily long and complicated:
1. Place the graphic on a transparent background
2. Use the magic wand to select transparent space, using the tolerance value to define the cutoff point
3. Select Refine Edge, and shift the contrast up to 100. For some reason if I don't do this, photoshop will often "partially select" a pixel, giving undesired results.
4. Hit delete. This removes all pixels that were selected (transparent enough to fall within the tolerance)
5. Select > Inverse. Shifts my selection to everything except what i just delete, ie the actual graphic.
6. Using the color picker, i pick an appropriate neutral color from the main body of the graphic. or i use black.
7. Using the pencil tool, with the draw mode set to Behind, and with a colossal radius, i draw on the graphic. This fills in all the remaining partially transparent pixels with the solid colour that i chose
This workflow does the job perfectly for me, and exactly achieves my intended results. but i can only do it on one layer at a time (i usually need to do this on about 18 layers, for a character graphic).
So what i'm looking for here, is some way to automate this process. The overall point of it really is forcing all pixels to "take a side", becoming either fully transparent, or fully opaque. Is there any better built in way to accomplish this? or a plugin? I'm open to commercial tools and plugins, even.
Probably relevant, I'm using photoshop CS5
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May 13, 2009
This is probably really basic but... I'm a printer and only really use Photoshop for changing RGB to CMYK, clear cutting (with Vertus fluid mask) and things like that. However a lot of the photos I have to clear cut have been done already but not saved (or given to me to use) with the transparency still there. Is there some easy way to turn all the white pixels into transparency? Obviously you'd have to mask any white pixels in the image you wanted to keep. A sample is attached.
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Aug 9, 2006
Is it possible to change all white (#FFFFFF) pixels to transparent? I am using PS7.
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