GIMP :: Changing Background Of JPG Image Using Color To Alpha
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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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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Mar 17, 2011
I have a few images that I have saved from online that have an alpha layer in them. When I open them in GIMP, the checkerboard pattern makes it far too difficult to edit the image. When I try any of the obvious options for removing the alpha layer, the result looks awful.
How do I remove an alpha layer without changing the way that an image looks when it's viewed in an image viewer (or GIMP)?
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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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Mar 4, 2012
How do I outline an image so I can change the background color without changing the image color ?
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Mar 16, 2013
I am taking macro shots of flowers. I am using black mount board as the background color, but it always comes out as light grey or bluish. The flowers etc. are fine.how I get my image background to the color I want, in this instance Black
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Jun 23, 2012
How can I change the color of the background in an image from white to transparent?
I am using PSP v7.04
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Jun 30, 2011
I have an image and all I want to do is change it to a different color. So if the image is mostly red, I want to shade it blue but still keep its quality, meaning the light-red pixels will turn light-blue, and the dark-red pixels will turn dark-blue.
I prefer an option that automatically changes all the colors for the entire image, but if there is a shader tool where I have to manually shade the image, that'll work too.
I input the image, then I went to Image > Mode > RGB, and from there I went to Colors > Colorize and used the sliders to change the image to the color I want.
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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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Jul 24, 2013
I am trying to produce a new logo for our business that has a solid Blue cloud image on a transparent background. I need to add text over this but ideally it will show as white over the cloud background but blue when its over the transparent background.
Cant simply change the color of text as its a curved edge its going over. I assume I will need to do some form of punch out but not sure how to start this.
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Oct 10, 2013
Here is the image I am working with.
I want to change the color to hex #00aced (0, 172, 237). I tried the colorfy, but the image comes out purple. Another way that has worked for me in the past, with white images, is by clicking on the channel dialog and dragging the red down. Clicking on the eye, next delete the original image and than add a new foreground color based on what color I selected from the palette. Of course this isn't working either since the image is so dark.
Now in channel mixer it could work if the RGB would go higher than 200, but since my blue is 237 this is where I am stuck. It has worked with other colors, as long as the RGB is less than 200. This is by selecting each output individually, for example, starting with red and entering a value in red and leaving green and blue at 0. Next selecting Green, entering a value in green and leaving red and blue at 0, and so on... Is there some type of mathematical solution for using the channel mixer, or simple yet, is there a way of making my image more white, without losing my shadows?
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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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Jul 10, 2011
I am pasting a color image onto a BW background. When I do this the image converts to BW. How do I prevent this from happening? I want to keep the background BW and the pasted images color.
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Sep 16, 2011
When adding a foreground image to a "flaming" blue background, I find that the image I add takes on the blue colors of the background, rather than keeping its original colors.
The linework and highlights (indeed, most of the detail) remain - they just all turn blue, heh. Like it's trying to camouflage itself. How do I keep the foreground image from "masking" itself to the colors of the background?
Both background and foreground image layers are in .xcf format. Could this be the problem? Do I need to change one or both to something like .jpg or .gif?
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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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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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Aug 20, 2011
For quite some time I've been trying to find the best way to remove a white background from images. I've checked out the sticky thread on this forum and as my image isn't of great quality and because it features quite a lot of white that won't apply.
Recently I found this tutorial which is supposed to work great (as seen in the comments). However, I think that because of a GIMP update that won't apply anymore somehow. I was hoping you guys might know what was causing it.
Everything works well until I get to step 7, where I have to select to Alpha. There it selects just the outlines, but my selection includes inner parts of the image, not just the background. And then after I invert and delete, the white that remains still has transparent parts that show up on the upper layer. So, am I doing something wrong with the Alpha to Selection, is that tutorial updated or is there a better way to remove the background from ie. a logo with just one background colour which isn't of great quality.
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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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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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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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Mar 21, 2012
I have a B&W images. It's actually in RGB but all shades are gray. I would like to create an alpha channel whose values equal the brightness of each pixel. How do I do that?
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Aug 5, 2013
My task is to do a batch processing over an folder with images. I want to add an alpha layer to every image (png). The alpha layer is from a static second image (bmp).
I can accomplish the task in the GIMP front end manually, but the exactly same steps in my script aren't working.
Here's the script:
(define (script-fu-batch-alpha-add globalpha globpics) (let* ((filelist (cadr (file-glob globpics 1))) (filealpha (car(cadr (file-glob globalpha 1)))) (imgalpha (car (gimp-file-load RUN-NONINTERACTIVE
filealpha filealpha))) (drawablealpha (car (gimp-image-get-active-layer imgalpha)))
[code].......
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Jul 24, 2011
Thought I'd try Gimp on my new laptop instead of Photoshop. I'm making graphics for a game.
I needed to add an alpha channel to an image and edit it, including pasting into the alpha channel from the clipboard. Easiest thing in the world on Photoshop, but seems utterly impossible on Gimp.
I've looked at a few threads that discuss editing the alpha channel, and they make it sound like rocket science. Notable, most seem to involve juggline multiple other images and then following convoluted pasting operations to get anything down. Or using layer "Masks" which, as best I can see, are impossible to paste into (and I couldn't find how to convert these masks to alpha channels either.)
As it stands, I've failed to get anything onto an alpha channel at all, except some scribble that showed up in the tiny side icon but couldn't be seen in the main image.
I'm new to Gimp, and I'm hoping I've just missed something. What is the straight forward way to edit the alpha channel (drawing on it, pasting into it from the clipboard), and seeing the results at the same time. I've tried everything intuitive and nothing works.
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Jun 6, 2011
In short, I have two images open in Gimp. I need to add one the images to the alpha channel of the other image. How do I go about doing this? I was able to add an alpha channel but beyond that I am lost.
This bit will only make sense to 3D modelers. I have 3D model that I'm importing into a the Unity 3D game engine. One of the material shaders makes use of specularity maps. Normally the specularity map would reside in the alpha channel of the RGBA diffuse image, but due to file sizes, all these are released as separate jpegs. The idea is to make some parts of the 3D model more glossy as far as I know. The only way to do this is to add this specular image to the alpha channel of the diffuse image, and then the game engine can work its magic, making the skin look realistic.
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Jul 27, 2011
I have an existing (grayscale) image that I want to make into the alpha channel for another image.
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Mar 17, 2013
I want to change the size of the image in Gimp to 3957x4429 px (67x75 cm) at a 150dpi (the image we have has a 300 dpi.) When i do this in image - print size it keeps changing the width.
The system is not allowing me to get the picture a few cm larger. Is there any way I can overwrite this?
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Oct 21, 2012
Is there any way I can directly make a grayscale image into an alpha transparency channel?
I mean, NOT involving selection? Because selection by color to layer mask,is really difficult what I need to do the selection threshold.
Why is it easy to turn an alpha channel into a grayscale image but not the reverse?
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