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info about 4bpp/8bpp dimensions

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TIM/README.md
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@ -21,18 +21,36 @@ You can use open source tools : Gimp, Aseprite
To convert your image files to TIM, use [IMG2TIM](https://github.com/Lameguy64/img2tim) :
## 4bpp and 8bpp specificities
If you want to generate 4bpp and 8bpp TIMs, your original image must be in indexed mode with a palette.
* For 8bpp, < 256 colors
* For 8bpp, < 256 colors , and dimensions must be a multiple of 2
* For 4bpp, < 16 colors, and size must be a multiple of 4
* For 4bpp, < 16 colors, and dimensions must be a multiple of 4
See [FileFormat47.pdf](http://psx.arthus.net/sdk/Psy-Q/DOCS/FileFormat47.pdf), p.182
You can use TIMTOOL.EXE from legacy PsyQ to check your TIM files, or use Lameguy64's [TIMedit](https://github.com/Lameguy64/TIMedit)
# Reproducing the TIM in this example
```bash
img2tim -bpp 4 -org 512 0 -plt 0 481 -usealpha -o TIM4.tim TIM4.png
img2tim -bpp 8 -org 512 256 -plt 0 480 -usealpha -o TIM8.tim TIM8.png
img2tim -bpp 16 -org 768 0 -usealpha -o TIM16.tim TIM16.png
```
## Content of Makefile :
```mk
SRCS = hello_sprt.c \
../common/crt0/crt0.s \
TIM/TIM16.tim \
TIM/TIM8.tim \
TIM/TIM4.tim \
```
# Links
* [TIMexample on psxdev.net](http://www.psxdev.net/forum/viewtopic.php?f=64&t=313)