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[JackieJay]

Does anyone know of any Photoshop filters or any app that could resize images using HQx2 or any other similar pixel art scaling algorithm? 
Been searching around for over a hour and can't find any. 

[JaJitsu]

if you want to scale pixels in photoshop just go to image > image size and select 200%

BUT you have to choose "Nearest Neighbor" or else the pixels will become fuzzy

[Core Xii]

That's not what he was asking for.

I've been wondering about this myself. There are plenty of libraries implementing such algorithms for applications but really no standalone solutions for scaling individual images.

Maybe there exist Photoshop plugins?

[Ravey]

You can find the algorithms here and Grafx2 supports Lua scripting, maybe it's possible to make scripts to do this for you?

[raleigh]

http://web.archive.org/web/20070624082212/www.hiend3d.com/hq2x.html

There is a link for an executable that works on .bmp and .tga at the bottom of the page.

The good ones like hq2x and 2xSaI aren't ideal for preprocessing though because they antialias so you get bits of the background color mixed in along the edge. I don't know of anything out there right now that supports transparency.

[JackieJay]

Thanks for the links Ravey and raleigh.  

btw I tried playing with PS's artistic filters and I got half-decent results, though not exactly what I was looking for.

edit: raleigh,do you know how the does the app in the link you sent me works ? 
Clicking the executable or dragging a image to it doesn't do anything. I tried recompiling the source but it still doesn't work. 

[Hangedman]

run it through dos.

go to the folder: 'programname'.exe 'sourceimage'.tga 'outputimage'.tga

For me it didn't work anyway, so I found a different iteration elsewhere.

[JackieJay]

I managed to get it working, I had to drag two files into the executable, but it messes with the colors pretty bad. 
Like what used to be yellow is now blue and vice versa. Basically the only color that remained intact was green, which is kinda odd.

[John Nesky]

Did it swap the red and blue color channels? That's not unusual if a program is not careful about color channels.

[Hangedman]

Try other iterations that are out there. I found a different one that works perfectly but you have to manually select the size. Still command line.