First, you have to install libtiff. On Linux it’s almost certainly in your repository you should install a package with an name similar to libtiff-dev.<\/p>\n
On MacOS X I did the following:<\/p>\n
\r\ncurl ftp:\/\/ftp.remotesensing.org\/pub\/libtiff\/tiff-3.9.5.zip > tiff-3.9.5.zip\r\ntar xvzf tiff-3.9.5.zip\r\ncd tiff-3.9.5\r\n.\/configure\r\nmake\r\nsudo make install\r\n<\/pre>\n
Then create the following cpp file:<\/p>\n
\r\n#include "tiffio.h"\r\n#include <iostream>\r\n\r\nusing namespace std;\r\n\r\nmain(int argc, char* argv[])\r\n{\r\n\r\n TIFF* tif = TIFFOpen(argv[1], "r");\r\n if (tif) {\r\n uint32 w, h;\r\n size_t npixels;\r\n uint32* raster;\r\n\r\n TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &w);\r\n TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &h);\r\n npixels = w * h;\r\n\r\n raster = (uint32*) _TIFFmalloc(npixels * sizeof (uint32));\r\n if (raster != NULL) {\r\n if (TIFFReadRGBAImage(tif, w, h, raster, 0)) {\r\n\r\n\r\n cout << "P2" << endl;\r\n cout << w << " " << h << endl;\r\n cout << 255 << endl;\r\n\r\n for(size_t c_h=0;c_h<h;c_h++) {\r\n for(size_t c_w=0;c_w<w;c_w++) {\r\n cout << raster[(w*h)-((c_h*w)+(w-c_w))]%256 << " ";\r\n }\r\n cout << endl;\r\n }\r\n\r\n }\r\n _TIFFfree(raster);\r\n }\r\n TIFFClose(tif);\r\n }\r\n}\r\n[\/sourcecode]\r\n\r\nThis program converts a tiff file to a PGM (portable grey map) file. PGM is a simple text based format, this makes it very easy to debug. You can read more about PGM on <a href="http:\/\/en.wikipedia.org\/wiki\/Portable_graymap">wikipedia<\/a>.\r\n\r\nNote: It's not converting the RGB value to grey very well it's simply modding the value for the example.\r\n\r\nCompile the program as follow (on MacOS you'll need to have install XCode or another gcc version):\r\n\r\n[sourcecode language="bash"]\r\ng++ tiffsimple.cpp -ltiff\r\n<\/pre>\n
Then run it as:<\/p>\n
\r\n.\/a.out inputfile.tif\r\n<\/pre>\n
You can view the resulting PGM file with ImageMagick.<\/p>\n
Notes<\/h2>\n
You can also transform the TIFF coordinates rather than performing the transformation yourself when converting to PGM as follows:<\/p>\n
First, you have to install libtiff. On Linux it’s almost certainly in your repository you should install a package with an name similar to libtiff-dev. On MacOS X I did the following: curl ftp:\/\/ftp.remotesensing.org\/pub\/libtiff\/tiff-3.9.5.zip > tiff-3.9.5.zip tar xvzf tiff-3.9.5.zip cd tiff-3.9.5 .\/configure make sudo make install Then create the following cpp file: #include "tiffio.h" #include […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[16,15],"class_list":["post-544","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c","tag-libtiff"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1RRoU-8M","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/544","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/comments?post=544"}],"version-history":[{"count":4,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/544\/revisions"}],"predecessor-version":[{"id":547,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/544\/revisions\/547"}],"wp:attachment":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/media?parent=544"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/categories?post=544"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/tags?post=544"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}