Legacy ImageMagick Discussions Archive

got it. good point thanks.

another way to look at it :
file as in first post is 300_01.tif


This code supposedly takes a 1000x1000 section from the top middle and bottom of the supplied image and prints the detected skew angle. (test.bat)

FOR /F %%B IN ('convert %1 -contrast-stretch 10%%x10%% -gravity center -crop ...

i'm using version
Version: ImageMagick 7.0.7-22 Q8 x64 2018-01-22 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2015 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Visual C++: 180040629
Features: Cipher DPC Modules OpenMP
Delegates (built-in): bzlib cairo ...

Hi all
I'm trying to deskew scanned images but weird things are happening. https://gofile.io/?c=ZgXVTY

here is my command

FOR /F %%B IN ('convert %1 -gravity center -crop 1000x1000+0+0 -deskew 40%% -format %%[deskew:angle] info:') DO (
SET angle=%%B
echo angle %%B
)
convert %1 -rotate "%angle ...

i tested with ImageMagick 6.9.2-5 Q8 x86 2015-10-31 on windows 8.1 mogrify and convert both worked for me. Anyone else ?

post the actual image files

Thanks. That is exactly what was needed.

Hi All

I come accross this problem in various places, so hopefully I can get an answer on how to do this that I can apply in various ways.

This particular problem, I'm converting some images to binary, but sometimes I need to go back and redo one if it didn't convert well enough using a different ...

https://www.dropbox.com/sh/p0gjpa7k5x7twzl/AACziip0nPQe_RS1BOu1GdyZa?dl=0

Hi Guys Thanks for your replies. See the above dropbox link for the files. Interesting about the RGB data, I haven't yet had a chance to test any further yet, but the files are there if you want to have a look.

The idea was ...

Hi All

What I expect to be able to do is store an uncompressed TIF as a losslessly compressed PNG, and be able to convert the PNG back to TIF and have the same image as before. But it doesn't seem to be the case. Can anyone explain what is happening and how I may achieve my goal ? Thanks


W:\png ...

Hi Fred

I haven't you tried your innercrop script. I will test it later on some more challenging images. I'm intrigued with the sunset picture example - can the sensitivity of the the allowance be tolerated ?

I'm thinking for a scanned page that maybe has a v rip in the page, I would want to ...

Works nicely indeed. Thanks

OK , so i'm on the right track then. Would be good to clarify this somewhere as I had been puzzling this for a day or 2. But it would be even better if IM could have a built in 'internal crop' command or something. (which i imagine would be a shortcut to this kind of thing anyway, like rotate is)

Hmmm - I swapped sin and cos about so from
convert %1 -format "%%[fx:aa=%angle%*pi/180; min(w,h)/(w*abs(sin(aa))+h*abs(cos(aa)))]" info:

to
convert %1 -format "%%[fx:aa=%angle%*pi/180; min(w,h)/(w*abs(cos(aa))+h*abs(sin(aa)))]" info:

and now I think it works!

I wonder if this was caused by ...

Yes, I got that angle too, i mistyped in my post, now edited. I copied pasted the script from the info page above into my linux bash terminal and substituted the names of my file as below. Same result on my linux box, so ... perhaps the code on the page is wrong ?

#!/bin/bash
angle=0.783292
ratio ...