XnView Software

Posted: **Wed Dec 26, 2018 1:55 pm**

I've got a couple of png files that need to be altered in order to OCR them with Tesseract.
The dimensions are 100 x 13 pixels and I need to add 3 pixels to the bottom side of the images, resulting in 100 x 16 pixels.
(To enhance the contrast I add the -binary parameter as well.)

So basically what I'm looking for is the equivalent of the XnView command
Canvas resize: Add 3 dots/pixels from Top-Center of background/custom colour (#f6f6f6)
Is this feasible with NConvert?

Posted: **Wed Dec 26, 2018 2:28 pm**

You have the NConvert help file (-help) have you?

I would think the following option should work, if you try it:

Code: Select all

-canvas w h pos   : Resize canvas
              w h can be percent (ex: -canvas 100% 200%)
              or #x #y for offset
              pos top-left, top-center, top-right
                  center-left, center, center-right
                  bottom-left, bottom-center, bottom-right

You could check if setting w and h to the desired canvas dimensions works, and if not try the offset option, I'm not sure about that...

But will Tesseract produce useful output from such small pixel dimensions?

XnView Software

Extend png canvas size by a few pixels?

Extend png canvas size by a few pixels?

Re: Extend png canvas size by a few pixels?