Legacy ImageMagick Discussions Archive

Since this version 6.xxx is widely used in our company and is recommended, I would not like to change until it is needed

when I run convert -list format, I got PNG* rw- Portable Network Graphics (libpng 1.6.28) See http://www.libpng.org/ for details about the PNG format. PNG00* rw- PNG inheriting bit-depth, color-type from original if possible PNG24* rw- opaque or binary transparent 24-bit RGB (zlib 1.2.11) PNG32* rw-...

@snibgo

yeah looks like alpha channel value is different after image magick processed, because of this difference could we consider it as different?

Hi,

this is my scale command, I scale it first then trim the transparency on the border
convert a.png -resize 4500x5400! b.png

PNG version is related to ImageMagick version or not? since I work for industry, current image magick version is the widely used version our company

I used GMIP to take a look and looks like the original image has transparency in the middle and scaled image hasn't transparency, could we consider this as a difference?

Hi, @snibog

I am new to image processing, could you recommend what's the right way to view it? like by which software?

Hi, I run the convert- list format, and below is what I got PNG* rw- Portable Network Graphics (libpng 1.6.28) See http://www.libpng.org/ for details about the PNG format. PNG00* rw- PNG inheriting bit-depth, color-type from original if possible PNG24* rw- opaque or binary transparent 24-bit RGB (zl...

@snibgo

I saw there are some faded color on the original pic and there are not on processed image, could we take it as difference?

@fmw42 when I run ./convert on my remote host I saw this info Version: ImageMagick 6.9.4-1 Q16 x86_64 2019-09-29 http://www.imagemagick.org for platform version, I run this command, and here is output uname -a Linux mftp-ygw-p-f-2-1a-1ebf0e1c.us-east-1.amazon.com 4.9.184-0.1.ac.235.83.329.metal1.x86...

original image: https://drive.google.com/open?id=1ufx2A ... XZMolPcnf1
output image: https://drive.google.com/open?id=122q_p ... mGJcV0XuFz

yeah, but the image is 16MB, could you recommend a place I can upload image?
the version we use IM is ImageMagick = 6.9.4_1;

Hi, I have an original image, I scale it and remove the transparence but I randomly found one image, the output image is slightly different from original image anyone knows why this happening? the command I am using is to trim transparent space is convert SHIRT_ART_IMAGE1.png -format "%@" ...

but if plus x,y offset equals image's full weight and height ? can we assume it is transparent?

Yeah, but it takes too much time looks like, after getting rid of this command, time is durable now

basically if output coordinates is 0x0 I mean, can I assume it is a fully transparent image?