Does anyone know if Datacolor SpyderCheckr Color Calibration works with JPEG?

Ysarex · Nov 23, 2012

It's not for use with photos -- it's hardware for your hardware. It calibrates your LCD display.

Joe

manaheim · Nov 23, 2012

errr...

unpopular · Nov 23, 2012

ERROR AA9004 - CANNOT PARSE QUESTION

pixmedic · Nov 23, 2012

unpopular said:
ERROR AA9004 - CANNOT PARSE QUESTION

Is that similar to the ID-10-T error?

unpopular · Nov 23, 2012

in order for me to answer this question, I'd have to divide the result of the square root of negative zero by zero.

manaheim · Nov 23, 2012

PEBKAC.

bratkinson · Nov 24, 2012

unpopular said:
in order for me to answer this question, I'd have to divide the result of the square root of negative zero by zero.

For those familiar with computers, negative zero is represented as all bits set to 1...the first bit being the sign bit. Since it's a negative, the absolute number is the complement of the original number (all 1s become 0s, and all 0s become 1s), but negative. So, it's really (negative) 00000000000000000000.... And the square root of anything is whatever multiplied by itself results in the original number (2 is square root of 4, etc). Zero times zero is, of course, zero. So the square root of negative zero is therefore zero, then set negative, eg, to all 1 bits again...(FFFF to us mainframers). And dividing a number by itself, by mathematical definition, is one (1). So, the answer to your question is really negative (that old 1 bit up front!) zero.

And now you know why computers use 2s complement for mathematics...it eliminates the need for negative zero and all the hassles it causes. as a result, negative one is represented as 1000000000000010, and negative zero is 1000000000000001. Go figure!

unpopular · Nov 24, 2012

^^ i figured someone would point that out after I was curious what would actually happen.

you nerds take away all the fun.

MLeeK · Nov 24, 2012

Yes and no. Yes it works if you set the white balance in camera. It kind of works using the eye dropper. You cannot change the color in jpeg 100%. So it isn't 100% Especially when shooting indoors in bad light it's tough. But yes, it works.
Works much better with raw images because you can change your white balance 100% with a raw photo. Much more accurate.
Persional opinion (because I can never resist giving it) It's outrageously expensive. Get a GOOD neutral gray card and set a custom white balance.

manaheim · Nov 24, 2012

unpopular said:
^^ i figured someone would point that out after I was curious what would actually happen.

you nerds take away all the fun.

You anticipated the point and are calling him a nerd?

unpopular · Nov 24, 2012

... and the fact that I knew negative zero was possible in the first place ...

---

meh. back to looking up spectroscope attachments on DSLRs for ultimate white balance measurements!! because a grey card just isn't complicated enough.

IByte · Nov 24, 2012

bratkinson said:
For those familiar with computers, negative zero is represented as all bits set to 1...the first bit being the sign bit. Since it's a negative, the absolute number is the complement of the original number (all 1s become 0s, and all 0s become 1s), but negative. So, it's really (negative) 00000000000000000000.... And the square root of anything is whatever multiplied by itself results in the original number (2 is square root of 4, etc). Zero times zero is, of course, zero. So the square root of negative zero is therefore zero, then set negative, eg, to all 1 bits again...(FFFF to us mainframers). And dividing a number by itself, by mathematical definition, is one (1). So, the answer to your question is really negative (that old 1 bit up front!) zero.

And now you know why computers use 2s complement for mathematics...it eliminates the need for negative zero and all the hassles it causes. as a result, negative one is represented as 1000000000000010, and negative zero is 1000000000000001. Go figure!

Ugh COBOL language in my head ><