Everything you ever wanted to know about transparency but were afraid to ask.
5
votes
2answers
9k views
Making the background of an image transparent
I have some jpg images and I need for each of them to have a transparent background.
I have GIMP as a graphic tool.
I need to put them in a web page and I need to see just the main element and have a ...
7
votes
3answers
10k views
Add transparency to an existing PNG
I'd like to use this image on a web site.
What I need to do is change the background from black to transparent, so I can use the arrow on my site maintaining the page background.
I used Gimp to ...
5
votes
2answers
3k views
Why does my transparent PNG not look good?
I want to convert a JPG to transparent and using GIMP I added alpha layers and transparency same way I make a GIF transparent I converted it to PNG but it doesn't display well when I load it on my ...
2
votes
3answers
139 views
How to extract the black and white components of an image to superimpose it over colored backgrounds
Say I want to create a glowing button for a website. I would like to have the possibility to dynamically change the color of that button by changing the color of it's background.
For this I need to ...
2
votes
1answer
576 views
Using GIMP, can you “erase” a color?
I'm presently working on an iOS application and I am attempting to reverse engineer their standard alert dialog window. I have managed to figure out what the alpha value on the background it uses is ...
9
votes
8answers
2k views
Transparency to unpremultiplied RGB + Alpha
I have a transparent layer in Photoshop CS5 (so internally, it's most probably stored as unpremultiplied RGB component plus an alpha component per pixel).
Now I want to transform this to an opaque ...
3
votes
5answers
4k views
Replace black background with a transparent background
How can I add transparent background on this image instead of black background, but I also would like to keep the partial transparency effect on some of the particles and particles borders.
Could ...
2
votes
1answer
169 views
How to edit an animated gif in gimp to include transparency?
I have an ajax spinner which unfortunately has a white background in the corners. I want to remove the white and make it transparent using GIMP. How can I go about doing that? I tried opening it in ...
1
vote
1answer
90 views
Black-white and grayscale to alpha conversion for images
Is there an utility for converting all black-white and grayscale images from certain folder to the same images with adjusted alpha channel?
For example, for pixel (r:50, g:50, b:50, a:0) I would like ...
