Legacy ImageMagick Discussions Archive

Is there also an "median" statistic available from identify? Modern astronomy application do have a median value.

Like here from PixInsight:
count (%) 100.00000
count (px) 18103008
mean 6688.487
median 7316.994
stdDev 1845.198
minimum 2133.722
maximum 10527.492

ok, q16 is default in gentoo ... q16 makes no difference, still 52 seconds to identify the file. I am quite sure its a kstars/libgphoto2 issue.

hmm, I am on gentoo-linux and it seems there is no q16 build-flag, they only have q8,q32,q64 in their package manager.

I will try to compile manualy

I found it: using "%[fx:65535*mean.r]" I get my desired number.

With "%[fx:mean.r]" I get decimals from 0 to 1 but I need the integer values from 0 to 65535 (with 16bit images) as seen in the verbose output. I need this numbers because they are standart in astronomical software.

Sure, here is an image that came directly from kstars.
https://drive.google.com/file/d/0B-Xegfe-6xKaNGJzZ2JtZU1RTVE/view?usp=sharing
And yes, sorry, when I was writing about libgphoto I actually meant libgphoto2.
I will first ask the kstars people since they implemented the library and maybe there ...

Hi

I use this command line to show some stats that I need from my images because I only need mean/min/max/std.dev and bit depth of all channels:
And I need rmse values only, not the one that goes from 0-1 or 0-255
identify -verbose ../image.cr2 | grep 'min\|max\|mean\|deviation\|Red\|Green\|Blue ...

It takes considerably less time if you edit delegates.xml and change the --out-type from PNG to PPM and --out-depth to 8. However, you do lose image information if you make this change, but identify works much faster-- the command completed in 3 seconds rather than 16.

Sorry I need exact values ...

snibgo wrote: 2017-06-09T02:03:06-07:00 All the time will be in whatever delegate is used: dcraw or ufraw. "-verbose" will tell you which is used.

For a while, IM included a multi-threaded version of dcraw, but it wasn't reliable.

I got

Thank you very much for your anwers! I just found out there seems to be a difference in files acquired via libgphoto and those directly from the camera. My raws where read with kstars/ekos (astronomy) via USB from my camera and it uses libgphoto to do that.
My thought was gphoto reads the raw as it ...

Hi
I just noticed that using identify on an Canon Raw (EOS 700, *.cr2) takes 50 seconds when called:
time identify image.cr2
image.cr2=>/tmp/magick-15167CDydMTSdLK39.png CR2 5208x3476 5208x3476+0+0 16-bit sRGB 63.12MiB 0.000u 0:00.000

real 0m50.499s
user 0m58.773s
sys 0m0.129s

Is this normal ...