I want to delete all transparent pixels, how can I? CS6

I would like to delete all transparent pixels surrounding my irregularly (non-square) image. The TRIM function only trims to a square surrounding my image and not to the edge of the image itself. Is there a work around for this? I have looked around and haven't found one.
Thanks,
JB

Image have rectangular area they have a width and height boundaries as do layer. Not all of the rectangular area need to have content or be fully opaque, However the image boundary is a rectangle. Some file formats are like a Photoshop Background layer do not support empty area or even transparency so those file formats only contain image that are rectangles and have no transparency. Some file formats support transparency and empty areas so those images can be any shape and contain transparency still the image boundary is rectangular. Then there is the GIF file format an oddball format. It only supports 256 Colors. Pixels are mapped to one of the 256 colors selected for the image. If you want Transparency in a gif the number of colors is reduced by 1 to 255 the 256 color now indicate no content its not real transparency it just a no color pixel in other words off or no content.
So if you have areas that are 100% transparent there is nothing to delete the area is empty. If you have pixels that contain some transparency and you delete those pixels you delete details are you sure you want to delete all pixels that contain transparency? You will loose things like drop shadows

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I want to delete all transparent pixels, how can I? CS6

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