The list of uncompressed PPM images with sizes is here. MD5 sums of PPM images. If you wish to download the LPCB test images, here is what you should do. Click SEARCH METHODS on the bottom of page http://photojournal.jpl.nasa.gov Find Search by Feature Name, enter a and press Enter. Download all images with (1) date between 2011-01-01 and 2011-03-31, (2) width less than 10500 and height less than 10500, (3) three channels, e.g. 3456x2304x3, skip all images with resolution ending with x1. Conversion from TIF to PPM by NConvert 5.91: nconvert.exe -out ppm *.tif Exclude ex-JPEGs using this Detector for ex-JPEGs. Most probably you have downloaded 110 images, and 65 of them have been detected as ex-JPEGs. The remaining 45 images were split into two sets: 20 images (829 Mb) with stars, galaxies, and nebulae, 25 images (380 Mb) with everything else: Earth's surface, space bodies, artists' concepts, etc. Search for "sample raw images" on photographyblog.com, only pages with dates between 2011-1-1 and 2011-4-4. With the advanced Google search you will most probably see links to the following seven pages: 18 Jan 2011 http://www.photographyblog.com/reviews/sony_a580_review/sample_images/ 26 Jan 2011 http://www.photographyblog.com/reviews/olympus_epl2_review/sample_images/ 7 Feb 2011 http://www.photographyblog.com/reviews/olympus_xz1_review/sample_images/ 17 Feb 2011 http://www.photographyblog.com/reviews/sony_a55_review/sample_images/ 17 Mar 2011 http://www.photographyblog.com/reviews/fujifilm_finepix_x100_review/sample_images/ 22 Mar 2011 http://www.photographyblog.com/reviews/canon_eos_600d_review/sample_images/ 24 Mar 2011 http://www.photographyblog.com/reviews/canon_eos_1100d_review/sample_images/ Only images from the four most recent Olympus, Sony, Fujifilm and Canon camera reviews were utilized. On the Sony A55 page images 12, 13, 14 were excluded as they are very similar to image 11, and for the same reason images 7, 8, 9, 10 from the Canon set, images 7, 8, 9 from the Fujifilm set. Conversion to PPM format was done by NConvert 5.91: nconvert.exe -out ppm -high_res -raw_camerabalance *.orf *.arw *.raf *.cr2 None of the 62 images were detected as ex-JPEGs (same version of Detector, link above). Olympus' images are 10 megapixels each (30 Mb), Fujifilm's and Canon's 12 Mp, Sony's 16 Mp. Three cameras got Image Quality 4.5 on the Review Conclusion pages, only Fujifilm FinePix X100 has Image Quality 5.0. Since 10-Nov-2011 (and until 2016 or 2017) you could download test images from CompressionRatings.Com in GraLIC 1.11 format or in a ZIP archive. Since December 2017: see here. Return to the main LPCB page.