not a power of 2?
- Thread starter JimBrand
- Start date
Image sizes in trainz should be by the power of 2 so you need to use :
1x1 2x2 4x4 8x8 16x16 32x32 64x64 128x128 256x256 512x512 1024x1024 2048x2048
or you can mix and match to suit the texture
256x128 512x64 1024x512 2048x32 etc but only from the selection of numbers above .
1x1 2x2 4x4 8x8 16x16 32x32 64x64 128x128 256x256 512x512 1024x1024 2048x2048
or you can mix and match to suit the texture
256x128 512x64 1024x512 2048x32 etc but only from the selection of numbers above .
You will find the same error comes up frequently with BMP and TGA texture files on old assets. The meaning of 'power of 2' is that both the width and the depth of the image file must be multiples of 2. For example the sizes can be;
2x2=4 pixels
2x2x2=8 pixels
2x2x2x2=16 pixels
2x2x2x2x2=32 pixels
2x2x2x2x2x2=64 pixels
2x2x2x2x2x2x2=128 pixels
2x2x2x2x2x2x2x2=256 pixels
and so on.
You need to resize either the width, or the depth, or both dimensions so that the sizes in pixels are multiples of 2. This can be done with any graphics software such as Paint.net or Gimp and save the file under the same name. Make sure when saving the file that you do not use any image compression and if it is a TGA I use 24 bit.
Scottish
2x2=4 pixels
2x2x2=8 pixels
2x2x2x2=16 pixels
2x2x2x2x2=32 pixels
2x2x2x2x2x2=64 pixels
2x2x2x2x2x2x2=128 pixels
2x2x2x2x2x2x2x2=256 pixels
and so on.
You need to resize either the width, or the depth, or both dimensions so that the sizes in pixels are multiples of 2. This can be done with any graphics software such as Paint.net or Gimp and save the file under the same name. Make sure when saving the file that you do not use any image compression and if it is a TGA I use 24 bit.
Scottish
Correct me if I'm wrong, but a 512 x 460 image can't be resized to a power of 2. The 512 dimension is already a power of 2, so if the 460 dimension is resized to a power of 2, it changes the 512 dimension. At least that's what happens when I try to resize an image. To get the image resized would require cropping the image wouldn't it (eg: crop it to 460 x 460 and then resize it). Of course, cropping it would probably mess up the mapping of the image.
Mike
Mike
You are wrong !!
Th 512 is a power of 2, but the other dimension isnt
Unlick the keep aspect ratio and resize the other dimension to 512
Once mapped the mapping wont change (or shouldnt) you can try this by resizing to 1024x512, it will distort the image, but the mapping should be OK
CROPPING WILL effect the mapping. Have a play and you will see the effects.
Th 512 is a power of 2, but the other dimension isnt
Unlick the keep aspect ratio and resize the other dimension to 512
Once mapped the mapping wont change (or shouldnt) you can try this by resizing to 1024x512, it will distort the image, but the mapping should be OK
CROPPING WILL effect the mapping. Have a play and you will see the effects.
Thanks Paul for the clarification. It's not the first time that I've been wrong and I'm sure that it won't be the last. I had thought about unclicking the 'keep aspects ratio', but as you say, it would distort the image. I'll have to give it a try and see how it works.
Mike
Mike
ray_whiley
Active member
Another possibility would be to copy the 512 x 460 image and paste it into a new 512 x 512. There would be no distortion but there would be some spare space (512 x 52) - which might sometimes be useful - and of course mapping in a 3D design program would need some adjustment. I usually make sure that when I create a texture it is copied and pasted like this before doing any 3D mapping.
Ray
Ray
OK guys i am new at this the current size is 512x460 the new size is 512 x 460 . where do i type the numbers into set new size or set new size as percentage of original. i am working on the loco dash 8 csx 7545 Grey Ghost kuid 98966:51019:1 by the way it's in a TGA forum
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I don't know which program you're trying to use to resize it, but if you're using IrfanView, then once you open the file, go to the Image/Resize Resample tab and in that window, uncheck the 'Preserve Aspect Ratio' box. Then you can change the size to 512 x 512 or any other size that is a power of 2.
Mike
Mike