GIMP :: Black Alpha (RGB+A) Transparency?
Dec 7, 2011
making a alpha channel transparency; Funny thing is. I made it work once a few days ago. I went to bed and forgot to write down how i did it (Tried everything, almost)
In the link right here [URL] n i have 4 files; Q3a_arrow_gimp_ver4.tga (TGA that works as i want it, you'll notice ALL the alpha channels have a black layer channel in the channels tab, how do i recreate that?) Q3a_arrow_methodtry.tga (tried to recreate with THIS tutorial [URL] with no success P.S. i tried loooads of tutorials but this recreation seems rather close to the working .TGA i need) Q3a_arrow.ai (sourcematerial all vector from Adobe Illustrator) Q3a_arrow.png (picture with transparency intact if needed for comparison)
So; Now... What i did to make the working picture was making a .PNG - drag it into gimp.. I recall doing some Alpha and or masking or selection thing with it, then rendered it for .TGA since Illustrator does not support the kind of .TGA i needed. Worked flawlessly in the engine where i use a function called alphafunc GE128 (blend with black as invisible layer and white as solid)
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Jun 17, 2006
How can I set transparency like when color is brighter it will be more transparent, eg. white is fully transparent, black is non-transparent, gray is 50% transparent, etc..
I would save png after that.
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Nov 25, 2012
Basically, I am trying to use an alpha layer/channel to export a picture that is transparent except for a grass clump that is colored green over the alpha layer. So the picture looks like a solid green rectangle, but is actually a green blade of grass.
Problem is, I cannot get the alpha layer to work. I can't follow the tutorial as it is in photoshop, and random videos on-line haven't worked.
(Here is the tutorial: [URL]...... from 08:40 - 09:30)
(I have also attached my practice file as a TGA)
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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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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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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 23, 2011
Basically just want to make the middle separating line in the following image:
Identical to (same degree of horizontal fadeout into transparency):
I have spent hours on it trying to edit the original layer below the alpha transparency or adding layers, getting nowhere.
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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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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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Jun 13, 2013
I have a graphic I am trying to create and whenever I save it as a .tif or .png, the transparency portion turns black...
I have seen several tutorials that talk about an Alpha channel...I have one!
What am I doing wrong?
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Feb 16, 2004
I'm developing a tile based game, I have basic ground tiles, and above these tiles can be objects. My game engine supports objects with an alpha channel, where the alpha channel is used for transparency:
alphachannel 0 = completely invisible pixel
alphachannel 255 = opaque pixel
alphachannel between 0 and 255 means the object and the background tile below that are blended, like semi-transparency.
This is useful to give the objects soft edges, and for semi-transparant fire, ghosts, and other nice looking effects. Code:
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Mar 14, 2003
transparency and alpha channels. I'll explain what I want to do, and hopefully someone can tell me how. I'm creating an image in a 3d modeling program. I want to export an image file (Targa, 32 bit, with Alpha Channels) into photoshop, then extract the alpha channel(that being the black background in this case) so that i'm left with the actual image of the 3d model over transparency, with which I can use to layer on top of things created in photoshop. Ok, that said, i'll explain it one more way, in hopes to make it clearer. I'm doing weather graphics for a news program, and have rendered out a cloud in a 3d modelling program(3d studio max). I want to import this image of the cloud into photoshop, and layer it over graphics I created in photoshop, minus the background created in the exporting from the 3d program.
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Dec 3, 2007
I was wondering if someone could help me create a PNG that when overlayed on an image only shows when its on top of black. ie the image underneath is black and in some spots there is color. Wherever there is black I would like the overlayed png to show. Wherever there is color I would like to the overlayed png to be transparent.
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Jun 29, 2013
Fireworks has so many horrible bugs, I am making the switch to Photoshop cs5.5 --- I have used Fireworks exclusively since 2001.Here's my question: {URL}....
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Jul 3, 2013
In PSP 8 I made a circular white clock face with black numerals on green background. I then saved it as a PNG, specifying the green as the transparent colour and specifying alpha channel.
It worked OK when viewed in my video editor, i.e. the green was transparent. But on opening it in PSP 8 I expected to see it displayed with the familiar chequer board background, yet it was a solid white.
So among many other PNGs it's impossible to tell that it does have a transparent area. Is this also the case in less ancient versions? What about other image editors - do they all have this weakness?
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Aug 14, 2005
I'm trying to do something that I could previously do with other image software. I want to 'paint' the transparency of a layer using the alpha channel. So when I paint black on the alpha channel it makes that part of the layer completely transparent, and white makes it completely opaque (and grey shades are in between). From what I understood of the help, this should be possible by just creating an alpha channel and painting in it. But when I try and then click back to display the RGB channel to look at the changes I've made, nothing actually changes. Whatever I seem to do to the alpha channel it doesn't actually affect the layer's transpancy at all.
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Aug 8, 2013
I think this is related to Xara's inability to export alpha transparency properly. I've talked about this before, somewhere. Feel free to find the old post.
The thing is, without a decent export the feature is largely useless isn't it? .Xar is almost never the destination format.
I can get round the edges issue by printing to PDF instead of exporting, but then the bounds of the original bitmaps are visible. So neither solution is any good at all. Surely this is a massive problem?
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Dec 6, 2011
png texture with alpha channel but the transparency seems to be white.
How do I let the transparency in the png texture look through to the background?(alpha blend)
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Mar 28, 2013
The problem: I am importing a PNG sequence into After Effects (CS 5.5), however AE refuses to see the Alpha channel contained within the sequence. Now before anyone jumps the gun and says, "But wait, PNG does not really support alpha, it just supports transparency!" Right, something I just learned, and still -- quite honestly -- baffles the heck out of me.
But anyway, another PNG sequence exported from the exact same program, imports into After Effects just fine with an "alpha channel" and all. I double-checked, and there is NOT an option in the program to export the PNG without transparency info.
Importing sample images from each sequence reveals the EXACT SAME THING ... both have transparency, but NEITHER have an alpha-channel per se.
1) why in the heck AE would interpret one's transparency, and not the other?2) Is there a way to FORCE AE to see the transparency of the one?3) IF not, is there something out there that will convert the PNG's with transparency to another format (TIF, TGA, PSD) with an alpha? I just don't want to have to re-render the sequences again.
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Jun 1, 2012
CS5, OS 10.6.6, 2.93 GHz Quad Core Intel Xeon
Making a mask from a selection the not-selected area is 95% black, not 100%.
So the not-selected area IS affected if the mask is applied, say using an adjustment layer.
Is there a preference somewhere, or a key command that was inadvertently applied?
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Apr 9, 2011
In photoshop there is a tab beside the layers tab, that allows you to add a shaded alpha channel to a .dds file.
I need to add a black alpha channel to a .dds file.
I've tried every alpha pluggin I can find but cannot replicate this effect.
And if I open a .dds file created in photoshop with a black alpha channel it is completely invisible in paint.net.
Why is it completely invisible in paint.net but not in photoshop?
How can I add a black alpha channel to a .dds file in paint.net?
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May 17, 2011
I was simply wondering the best means in Paint.Net to use a black and white image and use it as the alpha channel of my image, with white being opaque and black being fully transparent. I looked through the plugins on the site and didn't see anything that seemed to resemble what I was after.
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Jun 12, 2013
There is a touchscreen monitor in my car.It allows custom background wallpapers to be loaded via USB.The touchscreen automatically adds what would appear to be about a 25% alpha black layer in FRONT of the image so the touchscreen controls and icons are clearly visible.The problem is, I don't know what values I'm supposed to adjust on my image in order to get it to look the same way it does on my computer screen.Would you adjust the brightness? Contrast?Or is this simply not possible because the ~25% alpha black tint is placed OVER the wallpaper?
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Feb 17, 2009
My preferences are set up to display the layers transparency as grid size medium and grid colour light but when I use a layer the background is always solid black rather than the chequered design it is set up to be. I have tried altering the preferences, I have tried re-installing CS4 but nothing seems to make any difference.
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Apr 20, 2011
Designer Pro 6: I've made round cornered pix for a catalog. I export as a PNG and the corners show black in the Web app I'm using, but they are transparent so it's OK. The last set of pix were done in Xara Xtreme 5, when I exported those as PNGs the corners were white, and the transparency was OK. My question is why the white or black corners, and is there something I can do that will control that? I used the same approach in Designer as in Xtreme 5.
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Dec 16, 2012
Gray / black halo around feathered transparency objects. The halo occurs where the solid area of pic feathers to the transparent.
NOTE: Image looks fine in Photoshop(CS6) but when placed in Indesign (CS5) a black halo appears on page
This only happens when image is an RGB Tiff and layer mask is used to create transparency. If image is saved as .psd then it is fine. Also when RGB tiff is converted to CMYK then this is also ok.
Ideally I could just start using psd format, but I have to handle a lot of images that are already in RGB tiff and it is time consuming to have to open and re-save all of these.
Photoshop CS5 RGB tiffs are still working fine.
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Aug 31, 2011
This is probably super simple. I do a lot of transparency stuff for the Web. My background color for the most part turns out to be black. I get my transparency but the program I'm using at the moment does a cleaner job with white. When it's black I see a little trash of black around the edge of the graphic. In the past I've come up with white quite by accident and it was clean as a whistle. I'm exporting as PNG, True Color + Alpha.
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Jun 22, 2012
I have been working on a large number of sketches. At this stage I am just using the path tool to make the outlines of my cartoons.
I have got fairly confident with the path tool now, however on my first 3 pictures my paths were a mess. The first 3 pictures I stroked the path at 10 pixels, I would like to reduce this to 6 pixels. I am not able to go back to the original paths so I guess I need to select lines from the completed pictures and and convert these to paths, then restroke.
I have been trying to select by colour (it is all black) but that gives me the outline of the black, ie, a double path. I have tried selecting the back ground and expanding it by 2 pixels, this worked but not in tight corners.
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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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