Increase image size without interpolation (image magick)

daviddoria · #1 8th April 2009, 05:14 PM

Does anyone know how to turn off interpolation (resulting in each pixel simply being copied around itself multiple times)?

If I do this

Code:

convert -resize 5000% Small.jpg Big.jpg

it uses some default interpolation. I can specify an interpolation like this:

Code:

convert -resize 5000% -interpolate Average Small.jpg Big.jpg

But there is no option for "none". Anyone know an argument to do this?

Thanks,
Dave

JohnVV · #2 8th April 2009, 06:13 PM

using imagemagick , no . But in gimp you can select "none" when resizing .

daviddoria · #3 8th April 2009, 06:22 PM

Yea, I found that, but I'd like to batch enlarge multiple images, so doing it gimp isn't really an option.

Dave

daviddoria · #4 9th April 2009, 01:32 AM

I asked on the image magick forum and it is possible, and even easy!

Code:

convert small.jpg -scale 5000% big.jpg

RupertPupkin · #5 9th April 2009, 01:07 PM

Quote:

Originally Posted by daviddoria

I'd like to batch enlarge multiple images, so doing it gimp isn't really an option.

gimp can be used in noninteractive batch mode, so you could've used it (though you'd have to learn its Script-Fu command language, which isn't that hard). But for something as simple as this, ImageMagick is easier.