Adding transparency to all the colors of a gif

Hi folks

I'd like to add full transparency to all the gray colors and the white of these two background gifs which generate shadows:

http://ied.gospelcom.net/images/shadow1x140px.gif
http://ied.gospelcom.net/images/verticalshadow.gif


I understand it is possible to do this. Paintshop Pro won't. Ulead Smartsaver Pro 3 is claimed to be able to add transparency across different colors, but I can't seem to make it do this.

Can anyone advise on either how to use Ulead, or any other software that will achieve this?

Many thanks


Tony

Can't seem to get at the images you posted.
IF I understand your post correctly, make you images in photoshop with a white background. When all is said and done, delete your background layer by right-clicking on your background layer and click 'delete layer'.

Let me know if this does the trick.

[QUOTE=PWD]Can't seem to get at the images you posted.
IF I understand your post correctly, make you images in photoshop with a white background. When all is said and done, delete your background layer by right-clicking on your background layer and click 'delete layer'.

Sorry, my mistake! They are there now.

Not having Photoshop (!!), I remain unclear as to whether this is possible. What I have read elsewhere suggests that it is actually impossible to add transparency across different colors to a gif, and that all that is really happening is that some programs will merely change the colors that have been specified to a single compromise color, and then make that transparent.

If that is indeed the case, I am wanting a far too big range of gray shdades to be made transparent!!

Thanks for your wisdom on this


Tony