Bitonal bitmap out

Thread: Bitonal bitmap out

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Bitonal bitmap out
	2007-01-23 08:35:07
OK, one more stupid question: I want to output a bitonal bitmap. Nothing else, no header, one bit per pixel, so that a 80x256 pixel bitonal image produces a 2560-byte output. 'mono' format does exactly that, but the byte-ordering is lsb-first, whilst I want the reverse. ...and for bonus points I want to do it with perlmagick. I'm sure this is just my ignorance of available formats, or I'm missing imagetoblob parameters, but honestly I've tried my best and I can't get it. -- Illtud Daniel illtud.danielllgc.org.uk Uwch Ddadansoddwr Systemau Senior Systems Analyst Llyfrgell Genedlaethol Cymru National Library of Wales Yn siarad drosof fy hun, nid LlGC - Speaking personally, not for NLW _______________________________________________ Magick-users mailing list Magick-usersimagemagick.org http://studio.imagemagick.org/mailman/listinfo/magick-users
Re: Bitonal bitmap out
	2007-01-23 09:33:52
> 'mono' format does exactly that, but the byte-ordering is > lsb-first, whilst I want the reverse. The option "-enian" should be the solution: -endian type specify endianness (MSB or LSB) of the image. Use the -list option with a 'Endian' argument for a list of -endian arguments available in your IM installation. Wolfgang Hugemann _______________________________________________ Magick-users mailing list Magick-usersimagemagick.org http://studio.imagemagick.org/mailman/listinfo/magick-users
Re: Bitonal bitmap out
	2007-01-23 10:04:15
Wolfgang Hugemann wrote: > The option "-enian" should be the solution: Yes, you'd think so, wouldn't you. But: [ildleri statws]$ convert -list Endian LSB MSB [ildleri statws]$ convert test.pbm test.mono [ildleri statws]$ convert -endian LSB test.pbm test-lsb.mono [ildleri statws]$ convert -endian MSB test.pbm test-msb.mono [ildleri statws]$ diff test.mono test-lsb.mono [ildleri statws]$ diff test.mono test-msb.mono [ildleri statws]$ Basically they make no difference (and yes, test.pbm is a bitonal bitmap). Unless I'm doing it wrong. The mono format is specifically lsb, so it's probably doing the right thing by ignoring my endian param, but I can't get what I need - a simple bitonal bitmap without header in msb. -- Illtud Daniel illtud.danielllgc.org.uk Uwch Ddadansoddwr Systemau Senior Systems Analyst Llyfrgell Genedlaethol Cymru National Library of Wales Yn siarad drosof fy hun, nid LlGC - Speaking personally, not for NLW _______________________________________________ Magick-users mailing list Magick-usersimagemagick.org http://studio.imagemagick.org/mailman/listinfo/magick-users
Re: Bitonal bitmap out
	2007-01-23 10:43:35
> Basically they make no difference (and yes, test.pbm is a > bitonal bitmap). Unless I'm doing it wrong. I rather think, you should put it this way round, in order to load the image first: convert test.pbm -endian LSB test-lsb.mono > The mono format is specifically lsb, so it's probably doing the > right thing by ignoring my endian param, but I can't get what > I need - a simple bitonal bitmap without header in msb. But anyway this seems to make no difference, as the mono format probably settles whether to use msb or lsb. I yielded the same result un my Windows machine. In fact I got different results when using the versatile TIF format as the destination format. In this case, "msb.tif" and "lsb.tif" really differed. You will probably have to use an external tool to switch the byte order. Wolfgang Hugemann _______________________________________________ Magick-users mailing list Magick-usersimagemagick.org http://studio.imagemagick.org/mailman/listinfo/magick-users
Re: Bitonal bitmap out
	2007-01-23 18:16:39
Illtud Daniel on wrote... | OK, one more stupid question: | | I want to output a bitonal bitmap. Nothing else, no header, | one bit per pixel, so that a 80x256 pixel bitonal image produces | a 2560-byte output. | | 'mono' format does exactly that, but the byte-ordering is | lsb-first, whilst I want the reverse. | | ...and for bonus points I want to do it with perlmagick. | | I'm sure this is just my ignorance of available formats, or | I'm missing imagetoblob parameters, but honestly I've tried | my best and I can't get it. | You could try the PBM format, and delete the header. A PBM file usally consists of one line (the P1 is files 'magic number') P1 width height Then binary raster, immedaitely following single white space character after the height ascii number (usally a newline character). * row by row from top to bottom * Each row is width packed 8 to a byte, with don’t care bits to fill out the last byte in the row * in order left to right most significant bit to least significate bit * 1 = black 0 = white It sound like just what you want, so just strip the first line and you have your raw bitonal bitmap. If you want 0=black, -negate te image before the save. Anthony Thyssen ( System Programmer ) griffith.edu.au> ----------------------------------------------------------------------------- Don't you just hate those long signature files? I mean, there oughta be a law. If I were in control, .sigs would get cut off if they were ----------------------------------------------------------------------------- Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/ _______________________________________________ Magick-users mailing list Magick-usersimagemagick.org http://studio.imagemagick.org/mailman/listinfo/magick-users