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[Untelligent]

Save as -> Select the bar that says BMP and select from the sliding box PNG. You should notice a massive decrease in filesize.

Or just change the filename and put a .png on the end.

[sausage]

... no... just... no...

[Untelligent]

Whoops, sorry, I misphrased that, and quite badly.

I meant open it in paint, Save As a different filename, and with a .png on the end.

[sausage]

oh lol...

sleep with one eye open

[Draco18s]

Whoops, sorry, I misphrased that, and quite badly.

I meant open it in paint, Save As a different filename, and with a .png on the end.

I'm sorry, that doesn't work either.  You end up with FILENAME.png.BMP making the file a bitmap.

[Sowelu]

Put quotes around it.

"image.png"

That prevents Windows from screwing with the extension.

[G-Flex]

This is assuming MS Paint is even smart enough to compress it as a PNG just because you told it to save it with that filename.

NEVER assume a program will do that.

[RAM]

Open it in paint, use 'Save As...', Change "Save as type:" to anything that doesn't have bmp in it. Well, check what formats you can host, but basically, bmp is the least compact format you will encounter...

[Grax]

Open it in paint, use 'Save As...', Change "Save as type:" to anything that doesn't have bmp in it. Well, check what formats you can host, but basically, bmp is the least compact format you will encounter...

You just forget about TIFF? ;-)

[Draco18s]

Put quotes around it.

"image.png"

That prevents Windows from screwing with the extension.

It's still in bmp format.

[Sowelu]

Really.  Because I just tried it on my machine.  :x  Works for sure on my Vista box, and I'm almost totally sure I've done it successfully at home on XP.  Other programs open it as a .png, it has different file size from saving it without the .png on the filename, etc.  I don't know how many versions of MS Paint there are for XP, but probably not many.

Maybe you don't have all the service packs?  Wasn't PNG support a little spotty, early on?

[Derakon]

Grax: TIFF is more compressed than BMP.

% convert derakon.jpg derakon.tiff
% convert derakon.jpg derakon.bmp
% ls -hl derakon\.*
-rw-r--r--   1 chriswei  chriswei       12M Apr 29 12:16 derakon.bmp
-rw-r--r--   1 chriswei  chriswei      795K Apr 14 20:09 derakon.jpg
-rw-r--r--   1 chriswei  chriswei      776K Apr 29 12:16 derakon.tiff

In fact, to be less compressed than BMP, you have to be actively trying to waste space. BMP is the most simple image format you can have while still having a file that's in binary (as opposed to plaintext, for example). It simply records one int (or short, or char, depending on bitdepth) per color per pixel, in order.

[Draco18s]

In fact, to be less compressed than BMP, you have to be actively trying to waste space. BMP is the most simple image format you can have while still having a file that's in binary (as opposed to plaintext, for example). It simply records one int (or short, or char, depending on bitdepth) per color per pixel, in order.

Bitmaps are plaintext.  Almost.  You can replace the data in a bitmap with letters (well, the ones the represent each pixel, the rest are control characters/data) and it'll work just fine.

You have to be able to save back into binary from your text editor, but...

This image:
<-- yes there is a 4x2 image there.
is this when viewed in plaintext.