Here libjpeg-progs and libjpeg-turbo-progs conflicted, too. Both of them seem to provide a similar subset of image manipulating tools ("This package contains programs for manipulating JPEG files") as seen with apt-cache show. As libjpeg-progs is needed by konq-plugins while libjpeg-turbo-progs has no dependency (on my system), I purged the turbo ones. Still don't know if one of them is the 'better' one.
LANG=C apt-cache show libjpeg-progsPackage: libjpeg-progs
Source: libjpeg9
Version: 1:9a-2
Installed-Size: 202
Maintainer: Bill Allombert <ballombe@debian.org>
Architecture: amd64
Depends: libc6 (>= 2.7), libjpeg9 (>= 9a)
Description-en: Programs for manipulating JPEG files
This package contains programs for manipulating JPEG files:
cjpeg/djpeg: convert to/from the JPEG file format
rdjpgcom/wrjpgcom: read/write comments in JPEG files
jpegtran: lossless transformations of JPEG files
jpegexiforient/exifautotran: manipulate EXIF orientation tag
Description-md5: 18811a14939d885ee3988abf604b36d8
Tag: devel::library, interface::commandline, role::program, scope::utility,
works-with-format::jpg, works-with::image, works-with::image:raster
Section: graphics
Priority: optional
Filename: pool/main/libj/libjpeg9/libjpeg-progs_9a-2_amd64.deb
Size: 82062
MD5sum: e0c1133ad280dfd21dc46ce3eba35d22
SHA1: 16ef2c604a9194dce899b37bd820eb8e3daad5dd
SHA256: d59c55a111c214c7f6c035c97e73c05a5b72a42b9730eb2c67dd004aac74f214
LANG=C apt-cache show libjpeg-turbo-progsPackage: libjpeg-turbo-progs
Source: libjpeg-turbo
Version: 1:1.3.1-6
Installed-Size: 208
Maintainer: Debian TigerVNC Packaging Team <pkg-tigervnc-devel@lists.alioth.debian.org>
Architecture: amd64
Provides: libjpeg-progs
Depends: libc6 (>= 2.14), libjpeg62 (>= 1:1.3.1), libturbojpeg1 (>= 1.2.90)
Conflicts: libjpeg-progs <-- HERE !
Description-en: Programs for manipulating JPEG files
This package contains programs for manipulating JPEG files from the
libjpeg-turbo JPEG library:
* cjpeg/djpeg: convert to/from the JPEG file format
* rdjpgcom/wrjpgcom: read/write comments in JPEG files
* jpegtran: lossless transformations of JPEG files
* jpegexiforient/exifautotran: manipulate EXIF orientation tag
* tjbench: a simple JPEG benchmarking tool
Description-md5: db07a6383951821ac1b13910d3f5d17e
Homepage: http://www.libjpeg-turbo.org/
Section: graphics
Priority: optional
Filename: pool/main/libj/libjpeg-turbo/libjpeg-turbo-progs_1.3.1-6_amd64.deb
Size: 81794
MD5sum: 05ceaecde7a16cc8d0d78766aa69fc94
SHA1: ca73f37ea2b2e2936297fb1f889779362d93d61b
SHA256: cf93b80eb1feca4a673776f69865ba859485ffb0b7fb8f43ee6d966e73bbfbdd