![]() Since your background is white, selecting the white color and adjusting fuzziness to appropriately "fill in" the parts of white that show through your bottles should give you a pretty effective mask in about 30 seconds flat. Since the mask was a full alpha mask, the deletion will remove varying degrees of "opacity" based on how heavily an area matched the base color you selected initially. Once you have fine-tuned your mask, simply hit Delete, and watch the magic occur. This is probably the most ideal way to do what you need to do (based on your previous question, your trying to isolate a bottle?) The Color Range selection will give you an almost-ideal mask with transparency in tact.and you can further adjust that to fix areas that were selected that should not have been, or that were excluded and should have been selected. Once you have your baseline selection, you can then further adjust the mask using all of the normal masking tools in Photoshop. This creates a normal photoshop mask when you choose OK. You can also preview the selection in the full image. The color range selection tool is a pretty handy feature that lets you click a color from a gray-scaled version of your image, then use a "fuzziness" slider to adjust the range. I believe you can use the Select -> Color Range.
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