Use https://github.com/ImageMagick/ImageMagick/discussions instead.
https://imagemagick.com/discourse-server/
https://imagemagick.com/discourse-server/viewtopic.php?t=36078
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magick -size 800x600 "RGB565:Loading Default.2rawdata" crest.png"-evaluate LeftShift" and "-evaluate RightShift" implement the C operators "<<" and ">>". See http://www.gnu.org/software/gnu-c-manua ... t-Shifting . These shift, they do not rotate unless the top bit was 1 ("signed negative value"). So we generally need "-evaluate And" to mask the bits.HoraK-FDF wrote:yes that with the And is clear but when shifted on all other languages I know on one side zeroes come in an this would make the And unnecessary so does ImageMagick rotate interanlly meaning the bits leaving on one side come in on the other?
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magick ^
-size 800x600 -depth 16 ^
"GRAY:Loading Default.2rawdata" ^
( -clone 0 -evaluate And 63488 ) ^
( -clone 0 -evaluate And 2016 -evaluate LeftShift 5 ) ^
( -clone 0 -evaluate And 31 -evaluate LeftShift 11 ) ^
-delete 0 ^
-combine ^
f4.pngI've read about it on this pages:fmw42 wrote: ↑2019-06-03T14:36:35-07:00 I have never seen anything about geometry accepting offset in bytes. Where did you see that? Offset is in pixels according to https://imagemagick.org/script/command- ... p#geometry
Thank you very much.magick wrote: ↑2019-06-03T17:07:53-07:00 We'll add a 565 coder within a day or two:
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magick -size 800x600 "RGB565:Loading Default.2rawdata" crest.png
Thank you for the explanation and the simple version.snibgo wrote: ↑2019-06-04T05:01:32-07:00 "-evaluate LeftShift" and "-evaluate RightShift" implement the C operators "<<" and ">>". See http://www.gnu.org/software/gnu-c-manua ... t-Shifting . These shift, they do not rotate unless the top bit was 1 ("signed negative value"). So we generally need "-evaluate And" to mask the bits.
The evaluates can be simplified in a number of ways, such as:Note that 63488 is binary 11111000 00000000, and 2016 is binary 00000111 11100000.Code: Select all
magick ^ -size 800x600 -depth 16 ^ "GRAY:Loading Default.2rawdata" ^ ( -clone 0 -evaluate And 63488 ) ^ ( -clone 0 -evaluate And 2016 -evaluate LeftShift 5 ) ^ ( -clone 0 -evaluate And 31 -evaluate LeftShift 11 ) ^ -delete 0 ^ -combine ^ f4.png
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cat "Loading Default.frm16" |head -c -2400 |tail -c +37 |magick ^
-size 800x600 -depth 16 GRAY:- ^
( -clone 0 -evaluate And 63488 ) ^
( -clone 0 -evaluate And 2016 -evaluate LeftShift 5 ) ^
( -clone 0 -evaluate And 31 -evaluate LeftShift 11 ) ^
-delete 0 ^
-combine ^
f6.pngThanks for the info, but shouldn't ImageMagick be able to do this by itself? Can I ask for this feature to be added maybe right here or should I make a new post?snibgo wrote: ↑2019-06-04T15:11:42-07:00 You can use head and tail for that:Code: Select all
cat "Loading Default.frm16" |head -c -2400 |tail -c +37 |magick ^ -size 800x600 -depth 16 GRAY:- ^ ( -clone 0 -evaluate And 63488 ) ^ ( -clone 0 -evaluate And 2016 -evaluate LeftShift 5 ) ^ ( -clone 0 -evaluate And 31 -evaluate LeftShift 11 ) ^ -delete 0 ^ -combine ^ f6.png