bitmap image transparency

In photoshop I have a bitmap image (or what will eventually be saved as a bitmap image) which has a white background.

I want to make that background transparent.

There isn't much background to change..just in the upper right and left corners, and in the middle on the edges where the background shows through due to the curve of the tab.

Many thanks!

See screenshot:

Tom KnowltonWeb developerAsked:
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I don't think you can do that with a .bmp.  Try .gif or .png.  
Just found this.  It might help:

It talks about creating the bmp that you are talking about.
Tom KnowltonWeb developerAuthor Commented:
If I create a gif or png with transparency....can I then resave it "as" a bmp file?
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I have never created a bmp with transparency.  My experience is that as soon as you turn it into a bmp, you lose the transparency.  

I did a little more reading and everything I look at points to very limited support of transparency in bmp.  It is up to the program to decide whether to display a transparency in the bmp.  Is it at all possible to use one of the other formats?
Tom KnowltonWeb developerAuthor Commented:
I guess the actual images are GIF.

It's just the button maker tool I am using that wants the imported image to be a bitmap.

So my question do I create the transparent background for the resulting GIF images
So you say the button maker tool does not import gif?  That is strange.  Does it import png?  Either of those will support the transparency.  

Otherwise, it depends on what the button maker tool will allow you to do.  There should be a way to set a particular color as transparent.  Since I don't know the tool, I can't say how to do it.  
I wanted to try to follow up on this.  

If you have photoshop, do this:
1. Save for web.  
2. Choose gif as your option.  
3. You will have a color table with all of the colors associated with your image.  Click on white to select it.
4. Below the table, there is a transparency button.  Click it. This will replace the white with transparent.
5. Save the file.

You now have a gif.


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David BruggeCommented:
You can create bmp files with transparency, but not many programs can read them. They were used some time back for images for the early Microsoft Windows systems. Even if you could create a bmp with transparency, it's doubtful that your button program could recognize the transparency.

I'm curious as to how you will be using the transparency on the image. Are you wanting another image to show through the transparent areas? If so, will you button software allow you to load one image above another?

Perhaps a simpler solution would be to create your image in Photoshop using layers and save the results as a single bmp which you could then load into your button maker.
Has any of this helped?
Tom KnowltonWeb developerAuthor Commented:
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