How to make a colour transparent

[tonytysome]

I understand it is possible to make one colour transparent when you save a photoshop file for the web. This is useful to make objects appear to float over backgrounds on your web page.

My problem is that I don't know HOW to do this! When I save for web, I can't see how I select a colour to be transparent. If you set the background as transparent when you create your image, it just gets saved as a white background.

This is a basic question, so I am hoping there is a simple answer!

[Gaussian]

You need to select GIF or PNG, Jpeg doesn't support transparency.

[tonytysome]

Thanks. I think I did save the file as a Gif. What I am not sure about is what I have to do to select a colour to be transparent? How do I go about it, or where do I find the control to do it?

[Gaussian]

Do you have a transparent area in your image? If so, then this should also show up in your GIF file, just make sure that transparency is selected in the Save for Web window. You can also change one or more existing colors into transparency as shown in my attachment, but personally I prefer to have the transparency in the original document.

[tonytysome]

OK -- thanks. It is mainly making backgrounds transparent I am concerned with. I thought that if you make a background transparent in the image, it ends up as white when you save it for the web. Is that not the case?

[Gaussian]

Read my previous post