Everything you ever wanted to know about transparency but were afraid to ask.

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27
votes
2answers
107k 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 ...
11
votes
3answers
37k 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 ...
10
votes
2answers
6k 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 ...
4
votes
1answer
3k 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 ...
0
votes
1answer
1k views

How do I make a color background transparent? [duplicate]

How I can make color transparent in Photoshop? For example, I have picture of smoke, and I want to make background color (which is black) transparent. How?
12
votes
4answers
36k views

Photoshop CS5: Setting a black background to transparent

I have an image of smoke over a black background. If I set the blending mode of this layer to screen, the image's background is perfectly edited out, however if there isn't another layer below this, ...
4
votes
5answers
11k 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
3answers
281 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 ...
13
votes
5answers
26k views

Copy & Pasting from Photoshop to Illustrator loses transparency

I often run into this issue. I'm creating a file in Photoshop with masked layers etc. I want to make the final output available for some mock-ups in Illustrator, so I rasterize the layers and marquee ...
3
votes
1answer
5k views

Photoshop - turn white transparent, specifically preserving shadows - new issue

I have read articles all over the internet today. While some questions and answers are similar to my issue, none precisely cover my problem. I am currently doing CAD work for a website where my ...
11
votes
8answers
3k 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 ...
4
votes
2answers
12k views

Gimp - Using an image as the transparency layer of another image

I have two images (For the sake of simplicity, Image1 and Image2). I want to use Image2 as a transparency for Image1. How can I do that? Assume I've done little more with Gimp than play with some ...
6
votes
3answers
2k views

Batch replacing color with transparency

I have a very large number of PNG images (too many to practically do one at a time) with a bright pink background and would like to replace the background color with transparency. If this is not ...
6
votes
2answers
3k views

How can I remove white pixels around circles when exporting this to gif?

I took the loaders from here: http://xooplate.com/template/details/10888-5-animated-loading-spinner-action-icons-psd Than I exported them easily, with the help of the included action to a gif. But I ...
5
votes
1answer
257 views

GIF with transparency output not as expected in GIMP

I have been trying to create a GIF using a sequence of PNGs within GIMP An example PNG from the sequence shows the correct transparency I want to be shown in the GIF, But when I process the PNG ...
4
votes
2answers
128 views

How do I avoid selection box shrinkage when working with transparent layers?

TLDR: When I use the marquee tool to select a box around layer and then move it with the move tool, the selection box shrinks to surround the populated region of the layer. Is there a way to keep the ...
1
vote
3answers
779 views

How can I make a the lighter colors of a greyscale image transparent?

I would like to achieve in Photoshop this type of transparency effect (higher transparency values on the brighter areas of the image): How can I do this?
1
vote
1answer
163 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 ...
1
vote
1answer
443 views

“Replace” image (gradient) in image with alpha

Consider the following graphic: Note that the first image's background is transparent, and that the blue background in the second and third images is a subtle gradient - not solid color. ...
0
votes
0answers
46 views

Blur a transparent image [duplicate]

What I'm trying to accomplish is an image that is transparent and will blur what is behind it. I have tried to have a transparent background and then add a semi transparent white layer and blur that ...