   Mapping a .png color to transparancy in photoshop
  This seems like a stupid question, but I haven't found anything.  I have a .png image with a solid-color background.  I want to map that color to transparency in photoshop (CS3).  I can only get it to work if I switch to 8-bit indexed colors with Image->Mode->Indexed and then select Image->Mode->Color Table and eyedrop the color I want transparent.  How do I do it for non-indexed?  This seems like it should be simple...   
Quote:Original post by QuasiusThis seems like a stupid question, but I haven't found anything.  I have a .png image with a solid-color background.  I want to map that color to transparency in photoshop (CS3).  I can only get it to work if I switch to 8-bit indexed colors with Image->Mode->Indexed and then select Image->Mode->Color Table and eyedrop the color I want transparent.  How do I do it for non-indexed?  This seems like it should be simple...You should "search and replace" all pixels of that special colour with a transparent colour.You can select by colour range (globally, not with the magic wand that can miss isolated components) and fill the selection with a solid colour (again, globally, not with brushes or flood fill).Probably Photoshop also has a specific command to replace a colour with another colour.   