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From: Roscoe Cobham <roscob@privacy.invalid>
Subject: Re: Is there a way to make Irfanview AUTOCROP when it's kind of easy?
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From: Roscoe Cobham <roscob@privacy.invalid>
Newsgroups: alt.comp.os.windows-10,rec.photo.digital
Subject: Re: Is there a way to make Irfanview AUTOCROP when its kind of easy?
Date: Sat, 25 Nov 2017 06:52:38 +0000
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On 24 Nov 2017 03:11, Dan Jenkins wrote:

> Is there a way to make Irfanview AUTOCROP when it's a situation that isn't 
> too hard for an algorithm to figure out that there are black lines along 
> the outside of a set of photos?
> 
> Irfanview has a great batch facility on Windows, but the crop seems to be 
> manual.
> 
> Irfanview crops super easy, but usually, when I crop manually, I'm off by a 
> few pixels. 
> 
> If not irfanview, what else free and simple might have a good manual or 
> batch autocrop?


IrfanView has auto crop and batch auto crop.  For successful auto crop 
there is a setting which needs to be adjusted.

Look here for auto crop:   Edit | Auto crop borders (Ctrl+Shift+Y)

Look here for batch auto crop (follow all steps)
1:  Go to:  File | Batch conversion rename
2:  Put a check-mark in "Use advanced options (for bulk resize...)"
3:  Click the button "Advanced"
4:  "Auto crop borders" is in the 2nd column, 2/3 of the way down.


For successful auto crop, adjust the setting "Tolerance value for auto 
crop borders" at Options | Properties/Settings | Browsing/Editing.
A value of 64 works for me, but YMMV.  The default is 0 which does not 
crop everything.