-resize vs -thumb

Discussions on NConvert - the command line tool for image conversion and manipulation

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nah0y
Posts: 4
Joined: Fri Jan 27, 2017 12:20 pm

-resize vs -thumb

Postby nah0y » Fri Jan 27, 2017 12:23 pm

Hello!
First, thanks a lot for the AWESOME tool..

We can achieve the same result using :
-thumb w h
-resize -ratio w h

What's the difference here?
Does the -thumb command already uses -resize -ratio behind the scene? Possible adding -rtype quick too?

Thanks!

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helmut
Posts: 8116
Joined: Sun Oct 12, 2003 6:47 pm
Location: Frankfurt, Germany

Re: Resize vs Thumb

Postby helmut » Fri Jan 27, 2017 12:44 pm

nah0y wrote:What's the difference here?Thanks!

I assume that...
... -thumb extracts the thumbnail embedded in the image and resizes it to the specified width/height.
... -resize extracts the image and resizes it to the specified width/height.

nConvert might use the image data if there is no embedded thumbnail available in the image.

But I'm not familiar with nConvert and this is all guessing...

nah0y
Posts: 4
Joined: Fri Jan 27, 2017 12:20 pm

Re: -resize vs -thumb

Postby nah0y » Fri Jan 27, 2017 12:51 pm

I didn't know some images had the thumbnail in them too! Good to know. Thanks for answering!
Still waiting for a more precise answer though ;)


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