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4 total messages Started by Rob Sanders Thu, 05 Nov 1992 12:00

Wanted - Formats of image files

#675

Author: Rob Sanders
Date: Thu, 05 Nov 1992 12:00

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I am starting an image processing project for the final year of my 
course. This will deal with the subject of Matching using colour 
images. 

I know little at this stage & want to find out how images are stored in
files, i.e. how colours & pixels are represented, how the size of the 
image is stored etc. etc. I want to deal with some of the popular formats,
JPEG, GIF + others.

If anyone has documentation on this subject, I would be very grateful if
you could email it to me.

Thanks

Rob Sanders
rj_sande@csd.uwe.ac.uk

Re: Wanted - Formats of image files

#678

Author: Kevin Montgomery
Date: Thu, 05 Nov 1992 22:12

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Since this is rapidly becoming a FAQable question, I figure I'll go ahead and
take up the net bandwidth.

In Computer Graphics (ACM SIGGRAPH pub?), Volume 25, Number 2 (April 1991)
was a good article by Wayne Carlson (waynec@cis.ohio-state.edu) called "A
Survey of Computer Graphics Image Encoding and Storage Formats".  It is a 
good intro to image compression and described Huffman codes; Lempel, Ziv
and Welch (LZW) adaptive compression; and Run-Length encoding; and other
approaches, as well as the formats of Utah RLE, TIFF, PICT version2, IFF,
GIF, TGA, Sun Rasterfile, GKS/CGI, and CCITT Fax.  It also has a ton of
references to more detailed papers on those formats.

My 2 cents- when appropriate, let's try to use TIFF as a de facto standard-
while it does have its drawbacks, it's more general and prolific than the
other formats, supports lossless compression, and good public domain code 
exists for it (anon ftp to ucbvax.berkeley.edu:~ftp/pub/tiff)...

						kevin

Re: Wanted - Formats of image files

#714

Author: J.A. Clarke
Date: Tue, 10 Nov 1992 15:15

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Has anybody got a PC or Mac program that will convert a file of
integers from a framegrabber (512 x 512) into a recognised image
format such as GIF or PICT etc. Thanks

 Jim Clarke

Re: Wanted - Formats of image files

#718

Author: Wayne Rasband
Date: Tue, 10 Nov 1992 21:44

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In article <1992Nov10.151517.20312@gserv1.dl.ac.uk>,
J.A.Clarke@daresbury.ac.uk (J.A. Clarke) wrote:
> 
> Has anybody got a PC or Mac program that will convert a file of
> integers from a framegrabber (512 x 512) into a recognised image
> format such as GIF or PICT etc. Thanks
> 

NIH Image for the Mac will convert raw 8 or 16-bit data files into either
PICT or TIFF format. The latest version(1.47) is available by anonymous ftp
from zippy.nimh.nih.gov, in the directory /pub/image.

--wayne

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