I want to take an initial image which is facing North, and rotate it by 5°, save it as image0.png, then rotate the original by 10°, save it again as image1.png. Any way to automate this process? The most advanced graphic package I have atm is Corel PhotoPaint. Otherwise some kind of utility on the net?

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I can't image what you'd need it for, but there's probably scripts out there. For a game, why not just rotate the image yourself?

you could investigate imagemagick, which has a load of options for command line image processing.

I go with SP though... why would you want to do this? Are you unable(through project requirements) to use or create the functions to do this on the fly using hardware accelerated graphics?

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why not write your own little program to do it?

You know the rotation formula don't you?

Well write a program do that to every pixel of the target picture, and use say bilinear interpolation of the source image to work out what colour to paint with.

Without that interpolation, jaggies are going to be your biggest problem.

Agreed.

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If you are able to use 3d accelerated hardware, which I assume you can unless you're targeting a very specific device or people who also use those old 20 lb cell phones, it would most more efficient for the game to rotate via hardware. Loading all of those textures is going to end up costing quite a lot of memory, and there will be less chance for batching. Even a 32x32 image, which would normally be like 4 KB in memory (assuming a 32-bit, uncompressed format) would end up 288 KB of memory for 5 degree rotations.

Doing it on-the-fly also allows you to use better filtering and anti-aliasing for the rotation. This is normally lost when saved to a bitmap since it produces results based on the environment around it.

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Ok, reason I can't do that is because I get given an engine for this assignment and it doesn't have that feature for some daft reason.

Imagemagick looks like just the thing I need, but I'll look into it tomorrow

Thanks!

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I've made a little program to do this for you Igthorn.

Here is the source for it.

I hope that helps.

EDITED: Archive no longer double packed.

Woah! Very cool, it works well I like the name too

Thank you!

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No problem. I just hope the antialiasing works. Last time I did this I got the interpolation back to front. It would run a lot quicker without all tht RGB splitting, but it makes for better images

The AA looks great - although I have no idea how it works hehe.

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