bjb@pyrshadow.pyramid.com (Bruce Beare) (12/28/89)
I'm modifying the xloadimage program (comp.sources.x) to be able to directly display macpaint images on the X terminal. The macpaint format seems to be straight forward. It does, however, call the 'PackBits' function. Packbits seems to do some sort of a run-length encoding, but I don't believe that it is completely specified in IM. I've found no TNs that describe exactly what it does. Has anyone come across this little bit of trivia? -Bruce Beare bjb@pyrshadow.pyramid.com
andyp@gvgpvd.GVG.TEK.COM (Andy Peterman) (12/28/89)
In article <96197@pyramid.pyramid.com> bjb@pyrshadow.pyramid.com (Bruce Beare) writes: >........ Packbits seems to do some sort of a run-length encoding, but I >don't believe that it is completely specified in IM. I've found no TNs >that describe exactly what it does. > >Has anyone come across this little bit of trivia? Trivia indeed! Check out TN #171. It ONLY took me about 10 minutes to find this myself, having remembered that I saw this description somewhere. It seems that this Technote isn't reffered to by any of the indexes under the word "Packbits". Strange... Andy
bjb@pyrshadow.pyramid.com (Bruce Beare) (12/29/89)
In article <1455@gvgpvd.GVG.TEK.COM> andyp@gvgpvd.GVG.TEK.COM (Andy Peterman) writes: > In article <96197@pyramid.pyramid.com> bjb@pyrshadow.pyramid.com (Bruce Beare) writes: > >........ Packbits seems to do some sort of a run-length encoding, but I > >don't believe that it is completely specified in IM. I've found no TNs > >that describe exactly what it does. > > > >Has anyone come across this little bit of trivia? > > Trivia indeed! Check out TN #171. It ONLY took me about 10 minutes to > find this myself, having remembered that I saw this description > somewhere. It seems that this Technote isn't reffered to by any of the > indexes under the word "Packbits". Strange... > > Andy Mea Culpa. I tried to use the 'Tech Notes' stack -- for the first time. I checked the index for 'packbits' and did not find it. It never occured to me to look under the 'misc' category and find the '_packbits' routine. Thanks to the several responders who pointed me to #171. Gee, that was obvious, wasn't it. -Bruce
unhd (Paul A. Sand) (12/29/89)
In article <1455@gvgpvd.GVG.TEK.COM> andyp@gvgpvd.GVG.TEK.COM (Andy Peterman) writes: [On finding PackBits format] >Trivia indeed! Check out TN #171. It ONLY took me about 10 minutes to >find this myself, having remembered that I saw this description >somewhere. It seems that this Technote isn't reffered to by any of the >indexes under the word "Packbits". Strange... It's there, under "_PackBits"; which, is of course, far far away from PackBits. Perhaps this would be a good one-liner: "If you can't find it under 'foo' in the index, check '_foo'". -- -- Paul A. Sand | For this unavoidable excess I take full responsibility, -- U of New Hampshire | trusting that readers will sort out what is valuable -- uunet!unhd!pas | from what is not, and that those who find nothing of -- pas@unh.edu | value will forgive and forget. (Robert Grudin)