512x512 is ridiculous and unnecessary. 64x64 should serve your needs, and if not, try 128x128. I think you may well struggle with 512x512, since it's absolutely huge, and I doubt you'll be able to manage it, considering how you can't seem to resize the png.
As for how to do that, the original Minecraft textures are 16x16. This means that there are 256 pixels (16x16) per texture. Please don't confuse this with 16 Bit, that's something different.
The terrain.png is 256x256 pixels in width and height. This is because it consists of 16 textures on each row, and 16 rows of textures. Think of it this way. Each texture is 16 pixels wide. You want it to be 64 (for example) pixels wide. All that means is that each texture has to be changed from 16 to 64 pixels wide. 64/16 = 4, so you need to multiply the width of the png by 4. 256x4 = 1024. Do the same thing for the height and you get a 1024x1024 png. This will give you 64x64 textures. Hope this helped.
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As for how to do that, the original Minecraft textures are 16x16. This means that there are 256 pixels (16x16) per texture. Please don't confuse this with 16 Bit, that's something different.
The terrain.png is 256x256 pixels in width and height. This is because it consists of 16 textures on each row, and 16 rows of textures. Think of it this way. Each texture is 16 pixels wide. You want it to be 64 (for example) pixels wide. All that means is that each texture has to be changed from 16 to 64 pixels wide. 64/16 = 4, so you need to multiply the width of the png by 4. 256x4 = 1024. Do the same thing for the height and you get a 1024x1024 png. This will give you 64x64 textures. Hope this helped.