GIMP :: PNG Images And Transparency
Apr 8, 2013
My Gimp version……2.6.8.
Until recently Gimp has either supported transparency of .png image files or automatically added an alpha channel to the image. This I don't know. I do a lot of rendering and have always been able to take a .png or convert any image type to a .png, create a path, and delete everything outside of the path and end up with a transparent background.
But something has changed where I must now manually add an alpha channel to a .png image in order to end up with a “transparent background”. what changed in Gimp that I can no longer just erase or delete a selected area of a png resulting in a transparent area?
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Mar 11, 2012
I need to put images on websites such as headers, buttons, icons, just text and so forth.
I have saved my work first as .xcf for later editing. Then I save my work as .png that I have created with a transparent background. However, when I go to put them on the websites I am building there is Always a white background. ??
Even when I upload them to Photobucket there is a white background. But when I make .png images in Inkscape they load fine to Photobucket with no white background but again, when I try to put the Inkscape .png images on my websites they too have white backgrounds.
Also, when I save files with a transparent background as .gif and upload them to Photobucket the transparent background is there but the images look just awful. They are no longer smooth around the edges & look like the pixels are sticking out all around the images.
Also, when I save files as .gif and upload them to my websites they too have a white background. ??
I've been using Dropbox to send images to my biz partner and both the .png and the .gif are showing up with white backgrounds in Dropbox as well.
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May 22, 2012
I'm having trouble getting GIMP 2 to save some of my images with their transparency intact in .png format.
I've already performed the process of adding alpha layers and then removing the area I want to be transparent and then I've exported several images which have successfully retained their transparency.
I have three images, no different from any of the other twnty or so, that when I export them, do not retain ther transparency and instead fill in the entire background with white.
I've done other images before and since these three adn can't figure out why they're giving me trouble.
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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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Jan 25, 2014
Sometimes I make a fresh transparency blank of gimp. Then I import a jpg. I expect the transparency to appear as I erase. Sometimes it erases and there is white; sometimes I erase and it's transparent. ? Isn't it supposed to be transparent?
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Jan 3, 2013
ESTK for AI CS6 is already known to create problems (e.g. URL....).It’s possible that, in dialogs created with ScriptUI, AI CS6 also fails to display images with transparency properly. On my (Mac) system at least, such images appear with an aliased edge.
If this is true it’s doubly unfortunate, since with CS6 Adobe chose to make AI’s background interface colour adjustable—which makes interface images with transparency something of a requirement.
One workaround, which sadly negates the whole business of variable interface background colour, is to create dialog images with a background colour instead of transparency, and then force the dialog to display with the same background colour. For this technique we’re indebted again to Peter Kahrel’s invaluable ScriptUI for Dummies (URL...). Page 69 of that publication shows how to do this—for example:
win.graphics.backgroundColor = win.graphics.newBrush(win.graphics.BrushType.SOLID_COLOR,[0.5,0.5,0.7 5]);
The process is, to say the least, quirky: and, as Peter mentions, poorly documented by Adobe. But I hope it may be useful to others trying to use ScriptUI. The more I see of AI CS6 the more I like CS4! I develop scripts for CS6 using ESTK for CS4?
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Oct 4, 2012
The edges of this fabric are semi transparent. The grey colour to the area where the arrow points is caused by the photo's original background. Now I'm wondering is it possible to recreate the transparency so that the colours from a new background will show through. I've tried colour to alpha but that makes most of the image transparent.
The rest of the image is mostly black and greys with a splash of red. I would post the entire image but it's copyrighted - DA stock model - so I don't want to break the rules.
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Mar 26, 2012
How is it possible, to take the brightness of every pixel from the background, and transfer that to the upper layers transparency. (The upper layer is for example all blue). As I said before, I know that this works. I tried everything out and asked Google a lot of times, but I just can´t figure it out.
What I can remember doing there was just take the blue layer and transfer it to another picture. I was wondering because i didn´t do anything special.
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Jun 1, 2012
[URL]
In each program I have used from Corel Photo-Paint 11, Paint Shop Pro 5 and 7, to Gimp 2.6.11 the end result is exactly the same.
I select the background Invert the selection to pull it out of the original Paste the remaining image with transparent background or make an alpha channel The background needing to be transparent stays transparent.
The moment I save the image as a PNG, close the image, reopen it, check if the Mask/ Alpha channel data remains in tact, and it does, the transparency is completely removed and the background turns to white. This happens on every one of the programs and I am just at my wits end.
There must be something, an order of operations, a color scheme, a presetup step that -everyone- knows but me, that is preventing this from having a transparent background.
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Jun 25, 2012
I've to select an area ant turn the background transparent. Previously this was simple: select foreground, invert so background selected, toggle the transparency to 0% and hey presto, transparent background. Now when I do that it goes white.
I have tried using transparency - add alpha channel, and nothing happens: the menu stays there. Is that a glitch in y version of Gimp? and how can I now isolate the background and turn int transparent?
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Jul 20, 2012
I'm relatively new to photoshop and I have been searching for a simple answer to this question.
I'm working with images scanned from 35mm transparency film and black and white negatives. The average size when opened in photoshop is .88inches width x 1.297inches height at 2000 pixels/inch. I'll be putting these images on the web as well as printing some.
My question is:
Can I work with them as-is in photoshop and change the size later (for web, printing etc) or is there some general size I should change them too prior to working on them in photoshop CS5 extended?
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Jun 14, 2012
I'm drawing some illustrations and want to fill overlapping objects with a paper texture. I have done this using the Transparency window and placing a paper texture image over each object. The problem is that where the objects overlap to create the whole picture, they are quite transparent and so you get the effect of layers of tissue paper. I want each object to look completely opaque, but despite opacity being set to 100% on each object, they don't.
I've tried filling the objects with lighter / darker paper texture images and tweaking the Transparency settings to Darker / Ligher / Soft or hard light, etc.
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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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Jan 28, 2014
I loaded one PNG pic.
I added an alpha channel to make it a transparency.
I used the select by color tool.
I clicked white & removed.
I saved. I switched to eraser - but it is acting like I'm trying to erase something off the transparency layer and won't erase anything.
I have the correct layer selected in the layers window.
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Sep 4, 2013
I'm sure 'variable transparency' is not the right way of putting this.
I have an image which has some text in white. However because of the aliasing the text is not 100% white against the background (black). Rather; the edges are shades of white.
I want to convert the image so that the text is transparent. If the text was 100% white it would be simple. Colors.. Colors To Alpha. However that doesn't work as it doesn't deal with the shades of white around the edges of the text.
I want the shades of white to be transparent with the same degree of opacity as they white. So the white in the image is 100% transparent and a pixel which is say light grey to be 90% transparent. (The end image is going to be used as a webkit mask; showing the background behind the masked element).
I don't know where to start with this. I know PNGs support 8 bit transparency so it should in theory be possible.
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Dec 21, 2013
I have a PNG of sprites similar to this:
[URL].........
I want to change the background color to a transparent one. I've tried using Color to Alpha but that makes the sprites themselves partially transparent which is not what I want. My second attempt was to use the fuzzy select tool to select all of the white bits and remove them. This doesn't really work either because on a non white background each of the sprites has a few whitish pixels around it's edge. So what I really want is a combination of the two, i.e. all of the white pixels are made completely transparent, and the whitish pixels on the edge of each sprite are made partially transparent, but the sprites themselves remain opaque.
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Nov 22, 2011
*) Open the image "Ok.png" - you'll see there's a small green triangle on the right.
*) Mark and delete a bit of the triangle.
*) Save the image (I checked the 3rd (gamma), the 5th (resolution) and the 6th (time) checkbox).
When I now open the saved image in a different viewer (I use the picasa viewer because this viewer shows the transparent areas nicely), the image is still transparent.
*) Delete the rest of the small green triangle on the right.
*) Save the image.
When you now open it in a different viewer, then suddenly the background isn't transparent anymore. (It's then like the 2nd attached pic - Fail.png)
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May 7, 2012
I need to set transparency on a couple of layers, how do I do that in GIMP 2.8?
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Nov 5, 2012
Is there an easy way to flatten without losing transparency?
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Mar 16, 2013
Take any image. Enlarge the canvas to create an area of transparency. Find out you can't draw on it. Click and unclick the buttons by "Lock:" in the layers bar. Get really really frustrated.
What do I do to fix this (before I give up and uninstall Gimp)?
(to pre-empt the innevitable question - I can't draw on an area of transparency. Even if I copy a section of picture and paste into a new layer and move that to cover the transparent area, it isn't visible. Its like there's an area of completely opaque transparency covering everything else.)
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Mar 5, 2011
Are there different formats of transparency in a PNG image?
I've made a PNG image with transparency that looks fine (I see gray checkerboard through the image) when I close it and reopen it in GIMP. But in the Windows 7 picture viewer, all of the transparency looks opaque white. It is also opaque white when I load it into my Android app for use in OpenGL.
I've made PNG images with Inkscape, and they do not have this problem. The transparency looks correct in the Windows picture viewer, and in my Android app.
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Aug 15, 2012
I find myself creating new layers and making them slightly transparent all the time. But when I do this using Gimp it does not work right? This is what I am doing:
Add new layer
use transparency/opaque slider to change the setting
what happens is that the new layer stays solid until it goes below 50% on the slider and then it disappears, above 50% and it is back. It is like the 50% mark is an on/off switch for the layer.
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Sep 25, 2012
I have some objects in PNG which I want to keep the same size but I want to reduce all the transparency room so when I put them on a page the box is not so big.
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Nov 11, 2012
I have an animated gif in which I put in a transparent background on all the frames a long time ago. But the edges of the images were all anti-aliased, so the edges look pretty bad on a much different background. Now I want to change it back to the black background on each frame, and the origial file is lost.
I went through each frame and used Select by color to select the transparency, then Edit to fill the selection with black. However, most frames have a layer boundary that is smaller than the image size because the animation does not always fill the screen. The background on each layer/frame is still transparent. When I saved that work, only the current layer boundary in each frame shows - the rest is transparent. So instead of an unchanging size image with a black background, I get a variable sized one.
So I thought I would remove the alpha channel from each frame. That looks ok while the whole image is open in GIMP, but when I go to save it, GIMP puts the alpha channels back in each frame! I don't know why it's doing that. But I did notice that when I preview the animation with the alpha channels removed, artifacts are visible when the next frame is smaller than the one before it, so I don't know that it's what I want, anyway.
Can I change the alpha channel from completely transparent to completely black? how to make the blackgrounds transparent, but I can't find anything about undoing it.
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Feb 21, 2013
It seems I'm unable to save a png (or gif) with transparency.
I want to convert a white background to a transparent background so I perform the steps below but unfortunately the exported image still has a white backgroud. I've tried exporting to gif but that doesn't make a difference. Here are the steps:
1. I first add Alpha Channel
2. Select color to alpha and select white (this gets rid of the white background but now my image looks ugly as all the white is gone and it's partially transparent so I perform the next steps to add the white back to the image)
3. Duplicate the layer
4. On the second layer I add a layer mask and initialize it to white
5. On the second layer I use the bucket to color it all white
6. With the second layer selected I meticulously erase the white background knowing that if I accidently erase too much it wont be a big deal - it will only begin to expose the ugly image that.
7. I'm happy with the image so I merge the layers
8. Export to png and I make certain the "Save color values from transparent pixels" is unchecked
why the image I see in GIMP is losing the transparency when I export?
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May 20, 2012
I have made background png pictures and I have copied sections of such pictures onto other pictures, but the copy is never translucent or partly transparency and I have not found a way to do that. I can choose a degree of opacity when I simply fill an area with a solid color, but I have not found that option in the copy command. Is there such a capability in Gimp?
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Nov 25, 2013
I'd like to achieve an effect similar to the one shown here:
[URL]
What I need to do...
1.) Take screenshots of various pages of code (did this)
2.) Use masks (or maybe not) to apply some sort of texture behind each screenshot
3.) Use a perspective effect to rotate each page of code to varying extents
4.) Use masks and transparency (or maybe not?) to paste the pages on top of each other in layers
I should be looking up and combining to get there, and with other specifics.
Regarding (1), do I want to capture screenshots of black text on a white background? Or, the reverse? Regarding (2) and (4), are these right?
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Sep 11, 2013
I have imported a number of raster images into a drawing and wish to turn the "blank" bits transparent. I can set them all to "Background transparency = YES" in the Properties bar, but as far as I can see I need to go through each one individually to set the relevant transparency color, since as soon as I select more than one tile the "Transparency color" tab disappears.
Is there a way to do a multiple select as the "blank" color is the same for all the tiles? I'm planning to use a lot of tiles and this will be incredibly laborious and inefficient otherwise. I am using Map 3D 2011.
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Jul 28, 2013
I am well aware that several formats cannot handle layers or transparencys. GIMP however seems hell bent to remind me of this EVERY SINGLE TIME I TRY TO SAVE A FILE (and even pops up a second "Oh, these are the current defaults, are they ok?" type dialog on some formats.)
Is there a switch hidden in GIMP that reads something like:
"When I click Save, assume I'm smarter than a plastic fork and know what I'm doing and just save the file in whatever default format has been requested like I told you to and do not attempt to engage me in playing 20 questions."
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Jun 10, 2013
I have a large background image and I want to change (lower) the transparency of the header portion. I can select the portion with the rectangle, but after that I'm stuck. I tried changing opacity but it affected the entire image. I tried selecting Layer -> transparency -> add alpha channel, but that didn't do anything that I could see. How do I make the rectangle portion that I selected somewhat blurry?
Note: I did simply blur out the header portion of my image as one solution. But is it possible to add a layer over just the header part of the image and make that layer semi transparent?
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Oct 24, 2013
I have a Grayscale image where pixels are either white, transparent, or nearly white. My issue is, I need to convert this image such that:
1. All colors are converted to solid white with with an alpha channel (##FFFFFF)
2. The image looks unchanged
For example I want to convert a pixel that is FCFCFC to FFFFFF, but change the alpha channel so that they look the same. I'm assuming a black background.
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