Legacy ImageMagick Discussions Archive

That's it exactly. Note that this works with 6.4.0 and 6.5.4.1, but not 6.3.2. I guess the lesson here is not to trust the linux "file" command when it comes to color depths. Stick with "identify -verbose". Thanks for your help. What is the problem with 6.3.2? Is there an error ...

try

convert toRed.tif toGreen.tif toBlue.tif -combine PNG24:toColor.png

see -map

http://www.imagemagick.org/script/comma ... s.php?#map
http://www.imagemagick.org/Usage/quantize/#map
http://www.imagemagick.org/Usage/video/#gif

Unfortunately, I can't attach files in this forum. Could it be caused by me only having a green color channel (no red or blue colors) in the source tiff image? Have you seen imagemagick create a png24? I was browsing through the code, and it wasn't obvious that it was able to do so. You can post yo...

I think you will need to show me (us) an example as I am still not quite sure what you need. My only thought is to crop, rotate and then crop again or possibly use -virtual-pixels to extend/unfold the image so you have more to work with. An example would help understand what you want to do. Unfortun...

I think you will need to post your in.tif so it can be examined and used for testing

Thanks. I will have to study this. Looks promising to speed up the histogram and cumulative histogram. I have been using PGM to do similar things already. You had told me about that. A number of my scripts use it. Redist uses it now to convert the lut array (that I generate from the two text cumulat...

I understand, Just trying to be more helpful. A simular perl script can also replace the awk. Though please see my point about the default 8-bit histogram output being broken! I was surprised that was the case! Thanks I appreciate your input. It has been that way for a long time. I just assumed, so...

My redist and histmatch script do pretty much what you are doing in the shell, but I wrote a loop to do the integration (summing) rather than awk (as I know nothing, yet, about awk). My shell script is currently faster than the IM script above, but still not very quick. That was why I was exploring ...

still not quite sure what you want to crop, I think it is just the corner of the frame, but perhaps not. FYI, see my simple script, picframe at http://www.fmwconcepts.com/imagemagick/index.html or Anthony's much more advanced technique at http://www.imagemagick.org/Usage/thumbnails/#frame_edge. He s...

try

convert in.tif -depth 8 PNG24:out.png

magick wrote:Apparently the PNG specification only permits pixels per centimeter and does not support pixels per inch.

OK. 300 dpi / 2.54 cm/in = 118.11 dpc

P.S. Perhaps Anthony would not mind adding a comment to his page about PNG format to point this out. Thanks

IM 6.5.4.0 Q16 Mac OSX Tiger Create test image: convert rose: rose.png identify -verbose rose.png Image: rose.png Format: PNG (Portable Network Graphics) Class: DirectClass Geometry: 70x46+0+0 Resolution: 72x72 Print size: 0.972222x0.638889 Units: Undefined Now change the density and units: convert ...

convert -size 1000x1000 -font Times-BoldItalic -pointsize 30 -gravity center xc:transparent -draw "fill black text 1,1 'H20 MARK' fill white text -1,-1 'H20 MARK' fill transparent text 0,0 'H20 MARK'" png:test.png This works fine for me in IM 6.5.4.0 Q16 Mac OSX Tiger. Get a transparent b...

You cannot just have a diagonal line image! You have to have it filled out with some kind of padding (typically black or white) to a rectangular region. You may be able to extract the diagonal line data and format it into a string of text or into a horizontal or vertical image. Please clarify what y...