GIMP :: Bucket Fill Effect On Alpha Channel
Dec 17, 2010
I have a PNG logo that has anti-aliased letters on a transparent background. In other words, all pixels are white (for example) and either 0% transparent (in the letters) or semi-transparent (in the anti-aliasing). The rest of the image is transparent.
What I'm trying to do is take change the color of the logo. Bucket fill in normal mode changes the alpha value of the semi-transparent pixels to 0% transparent when applying the color--so I loose the anti-aliasing. I did manage to get what I want with bucket fill mode Darken only, but this only works for certain colors on certain other colors (I can change white to any other color, but not vice versa).
Is there a straightforward way to fill a color while keeping the alpha channel intact? I tried all the modes, and also modifying the Fill transparent areas, but don't really understand them to figure out if one does this in the general case.
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Oct 10, 2012
How do I bucket fill the way Paint does, where it fills every thing of a similar color? (or every thing adjacent, I don't remember.) It keeps filling my entire canvas, instead of the area I want.
[URL]......
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Aug 12, 2013
I have a 24bit PNG image to be used as a texture in my little game. I want to blend this texture with other colors which require it to have an extra alpha channel. I did some search online and tried some methods including add another layer and add transparency to the image, but neither worked(after I exported the image to png and reopened it, it still only contains 24 bits for every pixel).
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Jul 17, 2013
I'm using 2.6. How do I add an Alpha Channel?
I can't find it in the selections.
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Feb 7, 2014
I have an image that has a white background but that darkens in the immediate neighborhood of the image in question. So I do a bucket fill (red) with the threshold of 15 that sets the entire white(ish) area to red. So far so good. But then when I switch to fill this red area to white with the same threshold, I find small pixels of red adjacent to the image. I don't see how that is happening since the first fill set the entire filled region to one color (red) and I would expect that the second fill would completely replace all red with my new color (white).
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Jul 12, 2013
Is there an easy way in GIMP to invert the alpha channel of an image? Transparent should be opaque, opaque should be transparent, almost transparent should be almost opaque, etc.
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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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Nov 9, 2011
I'm trying to create an image which emulates a solar corona (it's basically just a blurry circle). It's as easy as making one brush stroke in gimp, but my problem is that i can't get all the channels to be correctly set.
Ultimately i just want to edit the alpha channel, NOT the RGB ones. They should all be pure white, or 255, 255, 255. But for some reason, no matter how much masking or color selection or clicking only the alpha channel and not the RGB ones or anything that i do, i cannot keep the RGB white while editing the alpha channel, every stroke that affects alpha seems to invariably affect the other three.
How can i edit ONLY the alpha channel?
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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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Jul 15, 2013
GIMP 2.8.6 on Window 8.I used Canvas Size to add a horizontal space at the bottom of a jpeg photo. (I want to use it for a text caption for the photo.) The new space is filled with a checkerboard of small light & dark grey squares.
I used the Rectangle Select Tool to select the new space.I clicked on the Bucket Fill Tool and moved the mouse over the new space. The mouse pointer includes a circle with a diagonal stroke through it, indicating I cannot fill the selected area.
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Mar 7, 2013
My link but when I get to the part where it says to add the alpha channel - add alpha channel is greyed out in gimp.
I'm using Gimp 2.6 - windows xp.
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Mar 21, 2012
Is it possible to directly edit the alpha channel? I need to edit it for a 3D model I've made, and its showing up as too shiney (The engine is looking at the alpha for reflectivity).
However, I have yet to see a way to edit the alpha channel directly.
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Feb 26, 2013
Basically I need to be able to add different information into each channel including the alpha without the image being transparent at all.
Not to compare at all, but in photoshop i could work solely in the alpha channel without the RGB channels visible, then enabling the RGB channels would allow me to see the entire image without any transparency.
Basically, i want to be able to use the alpha channel for things other than transparency. For storing different masks in each channel for use in shaders.
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Mar 8, 2013
I know how to add alpha channel to each layer individually and manually but is there a way to have an alpha channel added to each new layer automatically?
I'm using 2.8.2
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Dec 18, 2013
I started using gimp yesterday to remove backgrounds out of images for my website so have done it fine.
But now I clicked on something which reduced the toolbox dialog box to not be as large - ie it does not show you pixels size etc if you select pencil tool now.
Also I open an image and lasso it - then click the quick mask but the pencil tool is not adding any more to the area - it wont draw over or anything. The lock alpha button is on in the layers panel and I cant unlock it.
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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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Jul 22, 2013
1.I am working on a project where I need to set all pixels below a level as alpha channel, is there a quick way to achieve this? The level can be both set a prior or adjusted dynamically, the second way is preferred. Right now my workflow includes:1. duplicate layer.
2. use color level in duplicate layer, in menu COLOR -> LEVEL.
3. add alpha mask to original layer
4. copy duplicate layer into the alpha mask of the original.
5. delete duplicate layer.
6. If result is not ok then return to 1.As you can see this workflow is a headache, specially point 6 which is often achieved.
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Jun 4, 2013
Is there a simple way to create a "filled rectangle" in GIMP - without using the Bucket Fill Tool?
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May 18, 2013
I have some textures, and i am trying to pack them into texture atlas. All of them are RGBA png's generated with PIL (Python Image Lib). I am opening all of them in gimp and copy-pasting them into their new place in texture atlas.
But i have noticed something strange, i am storing specular map in alpha channel of my diffuse textures, and emission value in alpha channel of normal textures.
The problem is, that GIMP does not copy pixels with 0 alpha value into clipboard. So, when i am trying to copy a normal map from source to atlas, and if emission value is 0, then GIMP is not copying anything, i am getting empty layer pasted into my atlas, if there are 0 alpha value pixels in diffuse map they are not copied to destination, even selection outline shows that there are no pixels in places where specular is set to 0.
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Apr 7, 2013
I'm trying to put a pattern around an object that needs alpha channel in the middle, but when I make a new layer and add the pattern, then select the area and use "Color to Alpha" it doesn't work. The pattern in that area is only turn slightly darker, not alpha channel.
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Dec 12, 2012
I have removed the background from a photo using selection deleting to transparency via alpha channel. My dog was left. I then exported to png. When I try to upload the dog to use in a label, (Open Office), the back ground turns to white.
What am I doing wrong?
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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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Dec 26, 2012
For years I've been using various image editors, often in combination. That is, I do simple stuff as copy / paste and repositioning of elements in one editor and subsequently open the image in a more advanced editor for proper paintwork. Currently I'm using the Gimp for the latter. Color layers work brilliantly. However, I have big problems with my alpha channel--I've found no way to edit it within Gimp and I've found no way to import a revised version that I've edited in another image editor. There must be solutions to both challenges.
The editing I require is piece-of-cake in basic image editors--I simply want to move a transparent region a bit to the left. That should be a simple rectangle selection and then shoving it (mouse or arrow keys) to where I want it. Alternatively I could import my edited alpha channel image as I'm used to doing in other editors. Well, the Gimp will accept the image as a layer all right but I haven't succeeded in making the Gimp import my grayscale image as an alpha channel. I get a grayscale non-transparent layer instead.
So, I've got a perfectly good alpha channel that needs a minor tweak. It loads as intended in Gimp. How to perform basic editing of this alpha channel layer or tell me how to import a revised version and tell Gimp that this image should be interpreted as an alpha channel?
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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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Dec 15, 2011
I already have an image file in png format..which I want to use as an application launcher icon for my android application.
The android specifies image with following properties for the launcher icon(Will need 4 different image to support different screen size in mobile devices)
Launcher icons should be 32-bit PNGs with an alpha channel for transparency. The finished launcher icon dimensions corresponding to a given generalized
Screen density are shown in the table below.
1. 36 * 36 px
2. 48 * 48 px
3. 72 * 72 px
4. 96 * 96 px
I would like to create 4 png files(with specifications mentioned above) from the already existing image file. How do I do that in GIMP.
I am completely novice to image editing(Never touched any image editing software before) and not sure how to achieve this in GIMP.
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Nov 6, 2013
I have a series of images with alpha channels what I want to separate out from the images and save as a new file with a filename suffix.
For example I have a series of folders containing thousands of images:
These files are filename.dds files (I already have the .dds plugin to read them but you could use .png for example).
I load the image, goto Colours - > Components - > Decompose :
In the dialogue I enter color model : Alpha, tick decompose to layers - > OK
I then export the file as filename_a.jpg
Is there a way to batch this process for the 1000's of images I have?
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Jul 29, 2013
Win 7 64 bit
How can I use the bucket-fill option to fill an area surrounded by a dottedline?
The dotted line is a path; so if I use a line for the dots, the bucket-fillworks.
But how can I step back after filling to change the path's line into dotsagain?
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Jan 31, 2013
I'm trying to make a texture for a model in a video game, and I want some of it to be transparent. This is done by editing a text file that tells the model to use the textures alpha channel. things in the alpha channel that are white are transparent and things that are black aren't.
But I don't really know how to edit the textures alpha. Here is a video I've seen that explains how to make one in photoshop: [URL]......
How to do exactly what he does in gimp? whenever i duplicate one of the rgb layers, it isn't black and white like it is in ps. i'm also not sure how to have it turn into the alpha.
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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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Jan 7, 2008
im trying to add an alpha layer or alpha channel to a bitmap and save in BMP format.
I am using Photoshop 6.
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Jul 23, 2005
can someone tell me the easiers way to make an alpha tga file? Photoshop 7 can done alpha when i save to tga 32 bits, but in CS we have to do it manually...
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