RGB and Binary

[glorybound]

If I had a gray pixel on screen, which is ( R128, G128, B128 ), how would that look? is 1 pixel = 1 byte (8 bits)? 1 byte = 8 number, so it wouldn't fit, because you would need 9 places.

[instinct]

They are usually stored as byte values. A byte is able to store 256 distinct values, and you need 3 bytes to store RGB 8bit. 8bit is per channel, not per pixel.

Regards,
Thorsten

[instinct]

If your question was how the byte value of 128 is expressed as a binary, then the answer is 10000000.

Regards,
Thorsten

[glorybound]

If your question was how the byte value of 128 is expressed as a binary, then the answer is 10000000.

Regards,
Thorsten

Yes. 12-10's and 1-8 to equal a channel. I'm trying to visualize how this works. How did you get 10000000?

[glorybound]

I'll do a little reading tonight

http://www.math.grin.edu/~rebelsky/C...ry.html#1011-a

[instinct]

it's actually rather simple. You have 8 bits. each bit represents a power of two. So the eigth bits correspond to:
128|64|32|16|8|4|2|1

These are ignored if the bit is 0 and added if it is 1.

so e.g. 3 is represented as:

128	64	32	16	8	4	2	1
0	0	0	0	0	0	1	1

or as in the previous example 128 as

128	64	32	16	8	4	2	1
1	0	0	0	0	0	0	0

256 is all 1 obviously.

Regards,
Thorsten

P.S. Things get a bit more complex if we're talking floating point representations instead of integers, no matter what bit-depth.

[glorybound]

it's actually rather simple. You have 8 bits. each bit represents a power of two. So the eigth bits correspond to:
128|64|32|16|8|4|2|1

These are ignored if the bit is 0 and added if it is 1.

so e.g. 3 is represented as:

128	64	32	16	8	4	2	1
0	0	0	0	0	0	1	1

or as in the previous example 128 as

128	64	32	16	8	4	2	1
1	0	0	0	0	0	0	0

256 is all 1 obviously.

Regards,
Thorsten

P.S. Things get a bit more complex if we're talking floating point representations instead of integers, no matter what bit-depth.

That's what I'm talking about! I faintly remembered how it worked, but I couldn't piece it together in me head. Thanks for the help.

[MoonDoggie]

it's actually rather simple. You have 8 bits. each bit represents a power of two. So the eigth bits

256 is all 1 obviously.

P.S. Things get a bit more complex if we're talking floating point representations instead of integers, no matter what bit-depth.

Correction: "255* is all 1 obviously"

[instinct]

Correction: "255* is all 1 obviously"

True...was indexing 1- ... that's due to my TP origins i guess

[glorybound]

because we use 0, correct? 0-255, which gives you the 256... it's all coming back now )