I have a logo which is a black image on a white backgound. I want to add this image to my website (being developed in Serif Webplus 7) I want to change the white background so that either the background is the same as the block it is alongside or remove the background or make it transparent.
If you have Photoshop, make a duplicate of the background layer (Ctrl+J) and then delete the original background layer (drag it to the bin icon at the bottom of the layers palette). Now use the Magic Wand tool to select the white background of your logo - if the logo includes non-contiguous white spaces (such as in the middle of closed letters) hold down Shift and click on these too.
Once all your white background is selected, cut it (Ctrl+X). This will leave you with a transparent background.
As lotvic said above, you must now save this file not as a jpeg but as a gif. The easiest way is to go to File>Save For Web.
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