PixelCheckSum Pixel Info

[Fossil Rock]

Does PixelCheckSum contain any pixel color information ?

If so, can you tell if there is a certain color in the PixelCheckSum value ?

If not, is there a way calculate whether all the pixels are the same color or not ?

I'm asking beacuse I do not know how the PixelCheckSum is calculated.

[SmOke_N]

Does PixelCheckSum contain any pixel color information ?

If so, can you tell if there is a certain color in the PixelCheckSum value ?

If not, is there a way calculate whether all the pixels are the same color or not ?

I'm asking beacuse I do not know how the PixelCheckSum is calculated.

It's the sum of all the pixels, so the answer to your question is no.

Edit:

To the 2nd question, you'd need to write your own PixelGetColor()/PixelSearch() way of doing it, I've done it several times on the forum myself... don't know where though. Or, since you'll undoubtedly not like the speed, then write a dll doing it in C++ or some other lower level language. What are you making that you need specific colors found?

Edited September 22, 2006 by SmOke_N

[Fossil Rock]

It's the sum of all the pixels, so the answer to your question is no.

Do you know the formula for PCS? I would like to, if possible, reverse engineer it to determine if all the pixels are the same color or not.

Or is there possibly another way to accomplish this task ?

[SmOke_N]

Do you know the formula for PCS? I would like to, if possible, reverse engineer it to determine if all the pixels are the same color or not.

Or is there possibly another way to accomplish this task ?

I answered your question already (both of them).

[Valik]

The algorithm is Adler-32. I doubt that you can reverse it to get back the original pixels.

[Fossil Rock]

It's the sum of all the pixels, so the answer to your question is no.

Edit:

To the 2nd question, you'd need to write your own PixelGetColor()/PixelSearch() way of doing it, I've done it several times on the forum myself... don't know where though. Or, since you'll undoubtedly not like the speed, then write a dll doing it in C++ or some other lower level language. What are you making that you need specific colors found?

That's what I'm working on right now, and speed shouldn't be much off a problem, it's very small areas that need to be checked.

The project I'm playing with right now is an OCR related utility.

As to your most recent post.... sorry, I didn't notice that you had edited it so quickly.

Thanks

[Fossil Rock]

The algorithm is Adler-32. I doubt that you can reverse it to get back the original pixels.

Thanks, I'm writting my own routine, simply adding pixels (color) and then averaging them out.

All I need to know is if they are all white or not.

Thanks