saners platform: sparc sol10u8, gcc 4.9.0, with jpeg JPEG_LIB_VERSION 70 /* Version 7.0 */
using genesys_gl847 (canoscan lide 200) per subject with depth of 8 resulting jpeg image is ok $ identify xom_page_c200_8_29may_nc.jpg xom_page_c200_8_29may_nc.jpg JPEG 1680x2160 DirectClass 8-bit 679kb 0.0u 0:01 but with depth of 16 resulting jpeg image is broken: grainy background (gray shaded colored snow and overall image is only the upper left 1/4 of scan specified) plus 'identify' reports it as an 8 bit depth image. $ identify xom_page_c200_16_29may.jpg xom_page_c200_16_29may.jpg JPEG 1680x2160 DirectClass 8-bit 1863kb 0.0u 0:01 this 'broken' jpeg image was created using this command: $ /opt/csw/src/sane-backends-master-e13b80fa/frontend/scanimage \ --resolution=200 --mode=Color -B51200 --format=jpeg -x8.4in -y10.8in --depth=16 \ > /opt/csw/src/sane-backends-master-e13b80fa/xom_page_c200_16_29may.jpg note this issue is also present in sane-backends-1.0.27. can jpeg do 16-bit depths? the answers seems to be no, not with 'standard' libjeg. so should not scanimage: reject a jpeg format with depth 16 outright or warn that jpeg format is depth 8 and force depth 8 or presume depth 16 is paramount and warn that the output will be depth 16 tiff or some other option that i have not listed aloha ras -- sane-devel mailing list: [email protected] https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/sane-devel Unsubscribe: Send mail with subject "unsubscribe your_password" to [email protected]
