Legacy ImageMagick Discussions Archive

It would require a small modification to libpng in libpng/pngpread.c line 683, test for last_pass instead of 6, and in libpng/pngread.c line 3262, passes=last_pass instead of PNG_INTERLACE_ADAM7_PASSES then we could use -define png:last_pass={pass} where pass=1,3, or 5. But I doubt that you'd like t...

As others said, you need to turn off antialiasing.

Regular JPEG with quality 100 is "almost lossless". You probably cannot see the difference but you can measure it.

There is more to it. You must install a JPEG library that is capable of lossless compression/decompression, then use "-quality 100" to use it. See https://en.wikipedia.org/wiki/Lossless_JPEG. The WEBP, JPEG-LS, and JPEG-2000 libraries support lossless JPEG. But if you need lossless compres...

with this example also i have a problem under windows .\bin\magick -size 320x100 xc:lightblue -font georgia -pointsize 72 ^ -draw "fill black text 27,67 "Led Zeppelin" ^ text 25,68 "Led Zeppelin" ^ text 23,67 "Led Zeppelin" ^ text 22,65 "Led Zeppelin" ^ ...

Artman wrote:I have one more question. if its possible use this technique in GIF?
I never see semi transparent gif and i try now but its give just white image.

GIF only offers full transparency. To get partial transparency you'd need to convert your GIF to PNG and then proceed.

Don't let the date 2016-11-29 fool you. That's the date you installed your copy. ImageMagick-6.7.7-10 was released 2012-06-28.

Your original image isn't a one-bit grayscale image; it's a 16-bit Gray-alpha image in which the 8-bit Gray component is always black and the 8-bit alpha component carries the actual image of the text. You can make a visible image by doing magick working.png -background white -flatten png24:flattene...

If you want rgba8888 then ask for "png32:%%a.png" as output. You don't need to define the png:bit-depth because png32 implies bit-depth=8.

fmw42 wrote:Then try from http://www.imagemagick.org/Usage/formats/#png_write

-define png:bit-depth=24

just before the output

png:bit-depth must be 1, 2, 4, 8, or 16. An attempt to set it to 24 will be silently ignored.

I am using ImageMagick 6.8.6-0 and I am getting the same error. Was it fixed in this version? Yes, it seems so, according to the ChangeLog: 2012-08-28 6.7.9-3 Cristy <quetzlzacatenango@image...> * Don't remove color profile when setting the image colorspace (reference http://www.imagemagick.org/dis...

The PNG developer would like to know what version of IM you are using and on what platform (Windows, I suppose, because of the %%'s).

The "montage" utility doesn't have the capability you want. You'll need to make two separate montages, one for each row, and extend any 1- or 2-image row to full width, then use "convert -append" or "magick -append" to put the rows together. For greater control over the...

Verified that this morning's 7.0.3-8 beta works properly.

Thanks. Note, fmw, I had also tried using text.gif instead of text.png just to make sure the problem didn't lie in the PNG codec.