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Changes between Initial Version and Version 1 of Ticket #823, comment 1

initial	v1
5	5	2) Always performed a conversion to RGB color space.
6	6
7		Which choice is best depends upon the capabilities of the Python Imaging Library. The second approach is simpler as long as PIL allows RGB to RGB "conversion" and does not degrade the original RGB image, while the first approach is more intuitive, it is dependent upon PIL's ability to retrieve the color space info of the original file.
	7	Which choice is best depends upon the capabilities of the Python Imaging Library. The second approach is simpler as long as PIL allows RGB to RGB "conversion" and does not degrade the original RGB image (or treat it as an error condition), while the first approach is more intuitive, it is dependent upon PIL's ability to retrieve the color space info of the original file.
8	8
9	9	Once the preview file has been scaled, the only reason to convert back to indexed -- and thus degrade the preview even more -- would be to reduce the file size of the preview image. Thus I recommend against converting it back to indexed color mapping.