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.pbm file image render - [vhold] scanline-wiggles?

由 北慕城南 提交于 2019-12-13 04:40:17
问题 I'm trying to hack-up a program to read a pbm, pgm, or ppm file and render the image to the postscript output device using the image operator. Just testing the P4 input (binary portable (1-bit) bitmap) path, but my output is all screwy. %! % cf. http://en.wikipedia.org/wiki/Netpbm_format % cf. http://en.wikipedia.org/wiki/Computer_Graphics (origin of image) % $ wget http://upload.wikimedia.org/wikipedia/commons/thumb/2/23/Spacewar%21-PDP-1-20070512.jpg/320px-Spacewar%21-PDP-1-20070512.jpg % $

Create binary PBM/PGM/PPM

由 放肆的年华 提交于 2019-12-07 09:05:52
问题 I'm trying to understand how to create binary PBM/PGM/PPM files. As I know there are two types for each format: plain and raw. For example, structure of black PBM 5x5 looks like this: P1 # This is a comment 5 5 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 So as you see it is simple: white is 0, black is 1. However, PBM has raw version, which looks like this: 'P4\n# This is a comment\n5 5\n\xf8\xf8\xf8\xf8\xf8' How can I do it? Description of PBM format says: A raster of Height rows, in

Create binary PBM/PGM/PPM

由 不羁的心 提交于 2019-12-05 15:11:16
I'm trying to understand how to create binary PBM/PGM/PPM files. As I know there are two types for each format: plain and raw. For example, structure of black PBM 5x5 looks like this: P1 # This is a comment 5 5 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 So as you see it is simple: white is 0, black is 1. However, PBM has raw version, which looks like this: 'P4\n# This is a comment\n5 5\n\xf8\xf8\xf8\xf8\xf8' How can I do it? Description of PBM format says: A raster of Height rows, in order from top to bottom. Each row is Width bits, packed 8 to a byte, with don't care bits to fill out
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