1.91.6: De-Skew...random?

[Markus]

I have tried several times De-Skew an image, but the results varies:
-Usually nothing happens
-Image gets rotated by random degree

Or how the De-Skew should actually work then...?

<EDIT>Added version number to subject</EDIT>

[Clo]

—> Markus

Hello !

• This fiunction is for Black & White and Grey-scale images only,
please see THAT THREAD (and some others from the Search… )

KR
Claude
Clo

[Markus]

Hello, Clo!

I have tested the feature with colour images AFTER I have converted image to greyscale in XnView...

Maybe I have to retest this with first restarting XnView and making a note of every single action... ->

[Markus]

Made some tests...

Most correct results I can get, if I have a high contrast image, or draw a black line on white background.

If I have an image rotated with XnView without cropping and select the edge of rotated image (greyscale!), where is high difference in grey values, and try De-Skew, nothing happens.

In the same image those black lines on white causes an action and the imake gets rotated more straight.

I can believe, that it have to be very difficult to get program finding out of image, which is the line the user means to be straight...

Also, came in my mind, that why could De-Skew work on coloured images too, if the routine first would think image as an greyscale..?