Resources for Project Image I/O

Each of the following thumbnail images is a link to a larger 512×512 PGM or PPM image, except for the rightmost ones which are 256×512. Click on a thumbnail to download the image. The details of how to download depends on your browser.

Testing with the non-square rightmost image will help you verify that you have not mixed up the row and column indices in your program.

If you have a large enough screen to display a 512×1024 image, you may want to try out the following as well. [Image from Stockvault used with permission]

None of the images above have comments in their header sections. The following one does. If you apply the program in image-io-test-0.c of Listing 14.10 (page 130) to it, the output file won't be identical to the input file since our read_image() discards header comments. The images, however, would be identical.

Notes and errata

• Page 123, near the bottom, the two occurrences of $ image-io-test should be $ ./image-io-test. The last line on page 129 should be corrected in the same way.
• Page 123, third line from the bottom, “treated a stream of bytes” should be “treated as a stream of bytes”.
• Page 124, third line from the bottom, read_pgm_image() should be read_image() .

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