ADF not supporting jpeg compression

[Ikus-Soft]

While a line similar to "hp-scan --resolution=300 --size=letter --mode=color --compression=jpeg" will generate a small file with ".jpg" file extentions. The following line "hp-scan --adf --resolution=300 --size=letter --mode=color --compression=jpeg" will generate a huge PDF file.

It seams the compression is not well supported in ADF mode. According to my research, the raw image is saved in png files and bind together without compression in jpg.

To fix the problem, I've change the following line:

temp_output = utils.createSequencedFilename("hpscan_pg%d_" % page, ".png")

by

temp_output = utils.createSequencedFilename("hpscan_pg%d_" % page, ".jpg")