Skeetendo

Thank you, mate, It means a lot, coming from you. I have to admit, though, that my NIH syndrome has a negative influence on my attitude, sometimes!

Personally, I use a program I wrote, but there are other ways: Agixp and TLP can do it, although they need some adjustments in order to produce a correct GB-format picture. Specifically: Agixp adds bytes at the beginning and the end of the converted image's file, that you need to remove (it's 2 byte at the beginning and a byte at the end of the file, IIRC), while TLP requires the two middle colors ("light shade" and "dark shade") to be very distinct, or it could convert them as wrong colors (when I used to use it I solved the issue recoloring my sprites with green, i.e. #00FF00, as light color, and red, i.e. #FF0000, as dark color).

I may also publish my tool, but for some unknown reason it seldom happens (very rarely, to be honest, in fact I've seen it happening only twice) that it converts some bits incorrectly.

About WoodPression: I've fixed some minor bugs (not related to the compression algorithm, but to the GUI), and uploaded version 1.1 (including the source code, that for some reason I forgot to post the first time). Notice that it still performs only method 1, so it's far from being perfectly efficient; that's why you might want to try the program stag019 wrote.

Yeah no. Not at all.

Also Sawatika, I personally used Tile Molester to convert a BMP (or PNG) to the right format. I understand it may not be the best option, but it is another one. Here's a quick tutorial on how to do it:

1. Open TM and go to File -> New.
2. Enter the size you need. The size is calculated like this:
  a. Find the amount of tiles you need (4x4 = 16 for back pictures, sizes for front pictures include 5x5 = 25, 6x6 = 36, and 7x7 = 49)
  b. Multiply that by 16 (A tile is 8x8 pixels = 64 pixels, then * 2 bits per pixel = 128 bits, then / 8 bits per byte = 16 bytes)
3. Go to View -> Codec -> 2bpp Planar
4. Go to View -> Block Size -> Custom. Set the Columns to 1 and Rows to the width (in tiles).
5. Draw, or go to Edit -> Paste From to select a BMP or PNG image to paste into it.
6. Save.
7. ???
8. Profit!

Just remember, my tool tries every implementation, so it's more likely to compress better than Sawatika's tool. It's an online tool too. It's right here for you.

And it has an IPS function too.

Also, I wish there were a Tile Molester clone type program. I really like what Tile Molester has to offer, but there's a few bugs (mainly in the N64 graphics). And it requires you to use Java, which itself is slow. But it has pretty much all the features I like, plus or minus a couple...

It's Sawakita, by the way, not Sawatika.

I told you you should try stag019 program, because mine was far from being efficient.

You drew your picture with the wrong colors (i.e., you drew the white parts with black pixels, and vice versa).

Rhydon is fugly in that picture.

Actually this tool worked only once (at least for me) and anyway the online tool had a better compression, please, someone must bring back a decent compression tool because the online tool was knocked off.

Seriously, just use stag's C program. It's just like the online version.

AgiXP does not work with RBY. It only works for GSC. You have never seen that we all use AgiXP for Pokemon Red.