Raw image - Revision history

Andre Castro at 16:17, 29 January 2018

2018-01-29T16:17:52Z

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 <blockquote>Raw: This is the simplest of all ways to store images, just as "raw" bytes. For example one byte per pixel for grey scale or 3 bytes per pixel for RGB colour. There is no standard header and so even the size of the image needs to be specified for programs that might read the image. <ref>Bourke, Paul. n.d. ‘A Beginners Guide to Bitmaps’. Accessed 2 January 2018. http://paulbourke.net/dataformats/bitmaps/.
 </ref></blockquote>
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 What we are doing here is, not unlike playing back audio files at bit-rate and sample-rates, different from the ones they were encoded in.

2018-01-29T16:16:24Z

How to convert audio to images?

← Older revision		Revision as of 18:16, 29 January 2018
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	What we are doing here is, not unlike playing back audio files at bit-rate and sample-rates, different from the ones they were encoded in.		What we are doing here is, not unlike playing back audio files at bit-rate and sample-rates, different from the ones they were encoded in.

	~~== How to convert audio to images? ==~~
	~~...~~


			== What gets lost in a conversion ??==
			http://theghostinthemp3.com/

			...

	==code experiments with Raw images==		==code experiments with Raw images==

2018-01-29T09:14:21Z

← Older revision		Revision as of 11:14, 29 January 2018
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	</ref></blockquote>		</ref></blockquote>

			Imagemagick can convert a bit-map file to a raw '''.dat''' – a not specific file type

	~~http://rawpixels~~.~~net/~~		convert image.png image.dat

	~~Imagemagick can convert raw '''.dat''' – a not specific file type - into other image formats~~

	convert ~~-depth 8 -size 1000x1000 rgb:image~~.dat ~~raw.png~~		And, it can also convert the .dat back into a bit-map

	~~convert -depth~~ 8 -~~size 1000x1000 gray~~:image~~.dat raw.png~~		[[User:Andre Castro\|Andre Castro]] ([[User talk:Andre Castro\|talk]]) 10:14, 29 January 2018 (CET) if you run:
			identify image.dat
			img.dat PNG 2102x2799 2102x2799+0+0 8-bit RGB 256c 33.6KB 0.000u 0:00.000
			Hence the image still with PNG headers

	~~Note that both~~ bit-depth, size and ~~color profile RGB or grayscale~~,		If you stick to the size, bit-depth and color profile of the original, the conversion will "preserve" the original
			convert -depth 8 -size 2102x2799 rgb:image.dat image2.png

			If you change those parameters, it is likely that the resulting bitmap will be something else!

			convert -depth 8 -size 1000x1000 rgb:image.dat image2.png

			convert -depth 24 -size 1000x1000 rgb:image.dat image2.png

			convert -depth 8 -size 1000x1000 gray:image.dat image2.png



			What we are doing here is, not unlike playing back audio files at bit-rate and sample-rates, different from the ones they were encoded in.

			== How to convert audio to images? ==
			...

2018-01-29T08:24:17Z

← Older revision		Revision as of 10:24, 29 January 2018
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	http://rawpixels.net/		http://rawpixels.net/

	convert ~~-size 10000x1 gray:image~~.dat image~~.png~~		Imagemagick can convert raw '''.dat''' – a not specific file type - into other image formats

	~~xxxx~~		convert -depth 8 -size 1000x1000 rgb:image.dat raw.png

	~~==conversion==~~		convert -depth 8 -size 1000x1000 gray:image.dat raw.png
	~~'''Bitmap to raw'''~~
	convert ~~-size "2102x2799"~~ -depth 8 ~~input~~.png ~~output.rgb~~

	~~identify output.rgb~~		Note that both bit-depth, size and color profile RGB or grayscale,

	~~back to bitmap~~
	~~convert -size "2102x2799" -depth 8 output.rgb output1.png~~

	~~[[User:Andre Castro\|Andre Castro]] ([[User talk:Andre Castro\|talk]]) 22:13, 28 January 2018 (CET)~~
	* try to use raw
	* are any files created from a failed audio->img ?

2018-01-28T22:53:09Z

← Older revision		Revision as of 00:53, 29 January 2018
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	http://rawpixels.net/		http://rawpixels.net/

			convert -size 10000x1 gray:image.dat image.png

			xxxx

	==conversion==		==conversion==

2018-01-28T22:33:19Z

2018-01-28T21:19:15Z

← Older revision		Revision as of 23:19, 28 January 2018
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	<blockquote>Raw: This is the simplest of all ways to store images, just as "raw" bytes. For example one byte per pixel for grey scale or 3 bytes per pixel for RGB colour. There is no standard header and so even the size of the image needs to be specified for programs that might read the image. ~~</blockquote>~~<ref>Bourke, Paul. n.d. ‘A Beginners Guide to Bitmaps’. Accessed 2 January 2018. http://paulbourke.net/dataformats/bitmaps/.		<blockquote>Raw: This is the simplest of all ways to store images, just as "raw" bytes. For example one byte per pixel for grey scale or 3 bytes per pixel for RGB colour. There is no standard header and so even the size of the image needs to be specified for programs that might read the image. <ref>Bourke, Paul. n.d. ‘A Beginners Guide to Bitmaps’. Accessed 2 January 2018. http://paulbourke.net/dataformats/bitmaps/.
	</ref>		</ref></blockquote>

2018-01-28T21:13:03Z

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 With a small amount of code, it's easy to dump out a stream of data as bytes:
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 == Resources ==
 * This example is based on this [http://www.python.org.br/wiki/ImagemTGA Raw image example] (in Portugese)

2013-11-18T14:27:13Z

2013-11-18T14:23:19Z

← Older revision		Revision as of 16:23, 18 November 2013
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	</source>		</source>

			The "wb" option in the open command means that we want to "write" "binary" data (the default behaviour of read would be to read a text file).

	When you run the script:		When you run the script: