GIMP :: Color To Alpha With Exact Color?
Feb 3, 2013
I have a dark gray triangle alongside a pure white triangle in a square GIF image. I want to convert the white triangle to alpha and leave the dark gray triangle completely opaque. When I use Color --> Color to Alpha, however, I see the checkerboard pattern extend over the gray in addition to the white.
1. Does this mean that the gray is being made translucent?
2. If so, how do I set only one the white to alpha (at 0% opacity) and leave the gray at 100% opacity?
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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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Jul 4, 2013
When I color a the background of a photo to alpha it works just fine, I save it and export.
But when I try to open that same photo anywhere else the background is white .
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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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May 31, 2012
I am using the latest version of GIMP on my windows 7 pc but color to alpha doesn't work. At my pc at work it works fine but i use windows xp there and i have ghostscript and python installed.
Or is it something completely different?
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Mar 9, 2012
I don't understand how you can know which colors to use when applying "Alpha to Color".
Here are a few images I have and what I've done so far:
Here are my original images
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Oct 26, 2012
I have been doing light box photography, but I want to get that pure white background as product images usually have.
My background is a light grey.. Using the wand tool, I was able to get close - but far from close enough.
[URL].....
What's the right method, to turn every thing around the dime, white?
Here it is before the wand,
[URL]......
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Jul 24, 2013
All files that have "almost" a white background in coreldraw are not identified by contacogge of corel. The minimum percentage of magenta or yellow 1% 2% is M = 0 y = 0 while the same file in photoshop it appears correctly. la'llegato explains well what I mean.When i print image i see red in background and this is a great problem.
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Dec 4, 2013
I have a plain rectangle with overall c09300c0 RGBA levels.I want to change the alpha channel value from c0 (193) to some other value, for the whole image at once. Or some other color channel.
How can I change the absolute value of a channel ? The color menu has only relative adjustments.
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Mar 24, 2011
I have a texture for an object that will be rendered. The RGB for the texture contains diffuse color, and the Alpha channel contains a special parameter for the shader. The value for the parameter is 0 for 99% of the pixels.
In my XCF I have diffuse color on one layer, and the special parameter on another layer (as a greyscale).
So I copy the diffuse layer and call the copy Final. Then I create a layer mask on the parameter layer using the greyscale value. I copy the layer mask from the param layer to the Final layer, and then I apply the layer mask to Final, which should simply write the mask to alpha.
I look at the channels window to be sure, and alpha is written correctly, BUT everywhere that alpha is black THE OTHER THREE CHANNELS ARE ALSO BLACK! I can't fix this! What do I do? I even tried exporting to see if it carries through to the output image, and it does!
What's more, I tried to trick it by putting a very low value (like 1/2) in the pixels that are supposed to be 0 in alpha, and then I get an even weirder effect, wherein most of the color is kept, but some pixels color information is trashed anyway. Is there an export mode which will tell GIMP not to trash the color information on fully transparent pixels? Or better yet, can I tell it that alpha is not transparency?
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Sep 21, 2013
First time using GIMP. Following the directions here: [URL] ......
Using, "Color to Alpha," I tried to select the background of my .jpg image. The background is white, the picture (logo) portion is silver. Because of the closeness in color, when I select white, the software selects the entire image to become alpha (transparent).
When I select the color of the picture, silver, I am able to select just the logo portion. How can I take the logo portion, which is now converted to transparent, and give it a black or transparent background, and then return the logo back to its former color silver. The logo is perfect, it is just that I recently switched my site from a white header to a black header and the image has a white background, so that does not look good.
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Nov 26, 2013
I'm on MacOS 10.9 (Mavericks). Using GIMP 2.8.8 (lisanet edition).
GIMP has been installed for many years on my computers, but first since it runs natively (without x11 or xQuartz) have I finally and entirely switched to GIMP for my raster graphic work.
I really like GIMP and I'm working on expanding my knowledge and respect this excellent programme very much. There are of course a couple of oddities when you are used to Photoshop (until 3 months ago). I'm getting there. Though one issue sticks out:
The use of the eyedropper tool for example in the Color to Alpha Dialogue. First of all I'm aware about the difference between the Color Picker (set colour from image pixels) in the toolbox and the eyedropper. I'm writing here about the latter. It simply doesn't work at all. When I open Color to Alpha... and then click on the color field (by default it's white #ffffff) the Color to Alpha Color Picker opens. When I select here the Eyedropper tool (Click the eyedropper, then select a color anywhere on your screen to select that color.) the following scenario happens: the cursor doesn't indicate a particular function (stays as standard pointer) - when clicking anywhere on my screen both dialogues, Color to Alpha and Color to Alpha Color Picker disappear (respectively they slip behind the main GIMP interface). I can't select any color! And when I manage to get the two dialogue windows back into focus, I have to wait a certain amount of time before any pressing of OK or Cancel shows any response.
Sometimes a random color gets selected but this is beyond my influence.
I guess it's a weak spot of the new native GIMP without any X11 wrapping. The windows managements has several weaknesses (i.e. GIMP/Hide). I also thought that it might be caused by the Single-Window Mode. But even without that the problem remains. All in all it's a very important function and without it the workflow involved gets very tiresome.
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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 23, 2011
I have a picture of text (non-latin characters) that is multicolored. Most of the text is black but certain words/letters are purple, red, blue, etc. and I want to get rid of them. The black and white tool works but the previously colored text is now a shade of gray instead of being pure black. I also played with the contrast and brightness but it the text bleeds and becomes unreadable. The background is also pure white.
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Apr 16, 2012
This has happened during a few different projects I've had:
Short Version: I'm just trying to make sure that the colored box prints the exact same color as the PDF's color and it's not.
Long Version: Say I'm given a PDF, it's a poster, and it needs to have bleed (a border around it) added. I'll open Illustrator, put the PDF in there, and use a colored box for the additional bleed/border I'm adding. I'll use the eye dropper, click on part of the PDF - it'll give me the color of that spot. I'll take that color and apply it to the colored box, it changes color.
The issue is that sometimes, that color the eye dropper picks up doesn't actually match the PDF's true color. I can fill in the colored box with whatever color the eye dropper picks up, but it's often a weird color, like with CMYK number values being at 98.35% or something And even when the color value on the PDF and box are the same, you can see a slight difference between that colored box and the real PDF.
I'll even export that to a PDF and make sure it's correct, using the Object Data Tool or whatever it is, and then using the eye dropper there, and seeing that the color for my box and the PDF are at the same CMYK color values. And you can still see it's incorrect very slightly, and then when you print it it's obviously not the same. Even when I try picking it up in HSB or RGB, it's no good.
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Nov 13, 2012
I'm attempting to tilt this image for use in a game im writing. I've been using Map Object and rotation (Y) but this then causes pixel color changes on the boundary with the background color. How would I tilt this picture without getting the problem?
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May 22, 2013
How I choose a color for any new objects I want to create. I've opened the toolbox with ctrl-b, which appears on the left side of the window. If I want to , for example, draw a red rectangle, I use the rectangular selection tool, then the bucket fill, and I don't see how to change the foreground color to red.
I've read elsewhere in the forum that there should be two rectangles somewhere on the screen that show foreground and background color, but I don't see them anywhere.
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Dec 22, 2012
how to use a MacBeth color chart to the X-rite color checker in GIMP?
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May 27, 2011
So Ive learned how to turn a color photo to B&W with spot color ...how to turn a color photo sepia, but also spot color. I have a wedding photos that I think would be a fun shot to play mixing those colors together . I have searched for the info earlier today and wasnt successful .
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Dec 3, 2012
I seem to cannot find NOTHING on Google, I need the color notation for the pencil lead color... a standard pencil lead color... what is the notation for that color!!!
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Dec 19, 2007
I have recently stumbled upon a problem I cannot correct. I am using Corel 11 and although I have the default CMYK palette selected, all the colors ( for CorelDraw and PhotoPaint) are in 255 percentages as opposed to the 100% CMYK model. I must have inadverdently selected this color mode but cannot figure out how to revert back to the 100% model. This makes it impossible to determine the exact color you want based on CMYK percentages. I know this is a RGB model but all colors are displayed in CMYK ex. C- 233 M- 122 Y- 114 K- 155.
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Jul 13, 2005
I creat an alpha channel it shows up as white on my Photoshop Version 6 while my friend's alpha channel comes up in black on Photoshop CS. Obviously each is a default setting. How do you change the alpha channel color from white to black and vice versa.
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Jan 2, 2012
I'm working on a mobile game engine that uses RGB vertex color values for baked lighting, and Alpha vertex values for 2-material blending.
The system works fine in textured view (6), since we're rendering using our own shaders, but I would prefer to be able to turn on and off the alpha value when looking at the geometry in shaded mode (5). In other words, I want to be able to store and bake RGBA values, but in shaded mode I'd like to only see the RGB values so the meshes with blended materials don't show up transparent when I'm trying to light them.
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Jan 22, 2013
It's not really related to Paint.NET usage, but how it calculate the resulting color:
For example I make red background, call it C1:
RGBA = 255, 0, 0, 255
Then I place a yellow pixel, call it C2:
RGBA: 220, 216, 0, 200
Then I use the Color Picker tool on this pixel, I get C3:
RGBA: 227, 169, 0, 255
I already know how to calculate R, G, and B of C3
R = ( (C2.A / 255) * C2.R ) + ( (1 - (C2.A / 255)) * C1.R ) = 227
G = ( (C2.A / 255) * C2.G ) + ( (1 - (C2.A / 255)) * C1.G ) = 169
B = ( (C2.A / 255) * C2.B ) + ( (1 - (C2.A / 255)) * C1.B ) = 0
But for the Alpha channel, it is different and I can't find how to calculate it!
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Oct 23, 2013
Is paint.net v4.0 still promising color and alpha channel editing / masking?
I'm sure I read this in the roadmap feature list years ago, though I can't find the place to reference it. In fact this is my favorite anticipated feature for which I've been checking paint.net every month for the last five years!
I eagerly downloaded the 4.0alpha but see no sign of color channels to go with layers
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Jan 10, 2012
I am a texture designer as a hobby for an online game called Eternal Lands.
Ususally I just make my own textures, but I wanted to edit an existing texture this time. The texture is for armor called Red Dragon Armor, it has red scales on it.
I want to replace these red scales (without taking away the details such as the streaking and the scratches) with gold. I tried using "Color select" then "colorify" but it didn't come out quite right.
What is the usual method for changing the color of a section of an image if there are details and you don't want to use the "bucket fill" option?
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Sep 22, 2012
I have a layer that is all white with text and some shapes (with heavy anti-aliasing, so the alpha channel variations of white, too) and I am trying to convert it to a specific other color (just a cream color that I have the HTML code for).
So, when a layer is all one color (not counting variation in alpha values), is there a technique to change that to a specific other color, rather than just toggling the "Color Balance" to get an approximation?
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Dec 11, 2013
I am using the Color Exchange feature in Gimp 2. I am trying to change a red background to black. The Color Exchange feature allows me to do that, however, it comes out with only part of the color changed and it all very blotchy.
Here is a screenshot of what happens after I select the red square and do a Color Exchange from red to black.
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Mar 20, 2012
I'm using the 3D render engine vray, using its multimatte render element which assigns mattes of certain materials (or objects) in the scene to a channel: R, G, or B.
I'm curious about the best way to composite once I have this file rendered out. The simplest way I can think of is doing a color range selection on the matte channel's solid color, then using that selection to modify my image as necessary. But I have used After Effects to do this also, and there is a "channel select" effect that extracts the channel and converts it to an alpha mask in one step... makes me think there's a more elegant way in Photoshop as well.
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May 9, 2011
I can't get past square one with Tanel's Color-to-Alpha plugin.
I'm trying to get this foreground image:
to look halfway decent on both of these backgrounds:
To complicate matters further, there'll be more backgrounds to come, too, certain to be lighter in color (homage paid to Murphy's Law).
I've tried combinations of settings all over the map, but nothing gets even close. The jagged edge just won't go away.
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Nov 21, 2012
This question is more theoretical, as I have found a work around. On a layer, I have a gray color, which I sample, and it becomes the desired Foreground color.
I would like to Fill a Selection in an Alpha Channel with this gray color.
However, when I view the Alpha channel, my forground color is lost to black/white, which I understand, as the Alpha channel is a gray scale image.
But, I am able to sample a gray Swatch to make a Foreground color, but how can I preserve my chosen Foreground gray selected from a Layer? The only way that I know would be to make a new Swatch, and then use that when I am in Channels.
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