Scaling many pictures

ImageConverter:


ImageConverter DH0:MyFolder/#?.tif -w 800 -h 600 -of DH0:800x600/%f.png -f PNG


- requires TIF Datatype
- saves only as JPEG, PNG, IFF-ILBM and BMP
- handles Alpha Channel correctly and saves it in IFF-ILBM (ArtEffect compatible), PNG, BMPv5

Aspect ratio is preserved, 800x600 would be max dimensions.
Many other options are possible.

Same code as iBatch, only CLI Tool and not GUI.

I like to use mogrify, which is part of the imagemagick project, and exists on various operating systems (http://aminet.net/search?query=imagemagick). It is a shell command that does a lot of things. Let me give you a few examples.

- batch image resize keeping ratio intact
mogrify -verbose -resize 800x800 -quality 80% *.jpg

- batch image resize to the dimension exactly, stretching the images
mogrify -verbose -resize 800x600! -quality 80% *.jpg

- batch image resize keeping ratio intact, auto rotates the images if the orientation info exists in the exif info of the file
mogrify -verbose -resize 800x800 -auto-orient -quality 80% *.jpg

- batch image like previous example, but enhances the colors and brightness of the images, for better quality
mogrify -verbose -resize 1000x1000 -auto-orient -quality 85% -normalize *.jpg

> ImageFX is always an option. Macro recording etc is avauilable as well as batch processing modes.


Slightly OT, does anyone here know how to load a PNG image into ImageFX and keep its alpha level. When I load a PNG IFX does ask whether I want to load the Alpha or not, and even selecting Yes, IFX manages to somehow lose the alpha part of the image, which makes it pretty useless for modifying PNG or OS4 icons

@BillE

Perhaps IconEd will do what you want?

http://os4depot.net/share/graphics/iconedit/32biticoned.lha

@Lemen

> Perhaps IconEd will do what you want?

I have tried that already, it is useful but a bit too limited especially for my artistic abilities.

Anyway thanks to Cecilia who pointed me in the right direction. There are updated PNG loaders and savers on the Image FX 4.5 update disk. They never got installed so I added them manually and PNGs load properly now with the alpha information