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-100 Contrast equals black

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uberzev
not lyftzev

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Should equal 50% grey IMO.
Posted: June 25, 2006 4:00 am   Details E-Mail
byRo
an Englishman in Brazil

Posts: 138
Filters: 8
Yep, seems like the formula needs to be revised.
There's a 0 (zero) multiplying sosmewhere at -100 contrast - as can be seen 'cuz -99.99 does give 50% grey.

Rô

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Posted: June 25, 2006 8:26 am   Details E-Mail
Kraellin
Kraellin

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Filters: 99
so, 0 shld give black then? i mean, it sounds right, but i just want to make sure i understand here.

craig
If wishes were horses... there'd be a whole lot of horse crap to clean up!

Craig
Posted: June 25, 2006 8:46 am   Details E-Mail
Vladimir Golovin
Administrator
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Zev, byRo -- thanks for spotting this. It's definitely a bug. I'm assigning this to the programmers.
Posted: June 26, 2006 5:22 am   Details E-Mail
byRo
an Englishman in Brazil

Posts: 138
Filters: 8
Quote
Kraellin wrote:
so, 0 shld give black then?

Nope. As this is an adjustment, 0 (zero) should have no effect.

Contrast is the amount the pixel values are distant from mid-grey.

If you increase the contrast then the values will tend to black or white. At +100% contrast you should have only black and white (ok, maybe if something was exact mid-grey it would stay that way).

Conversely, at -100% there should be no distance from mid-grey.

Quote
Vladimir Golovin wrote:
Zev, byRo -- thanks for spotting this.

All credit to uberZev, I just tagged along.

Rô
_________________________________
My favourite question is "Why?".
My second favourite is "Why not?"
Posted: June 26, 2006 6:04 am   Details E-Mail
Vladimir Golovin
Administrator
Posts: 3446
Filters: 55
Fixed.
Posted: June 26, 2006 6:24 am   Details E-Mail
Kraellin
Kraellin

Posts: 12749
Filters: 99
Ro, ok, i get it. i was thinking too much about a single value rather than contrast, which would involve more than one value being compared. thanks smile:)

craig
If wishes were horses... there'd be a whole lot of horse crap to clean up!

Craig
Posted: June 26, 2006 1:13 pm   Details E-Mail
byRo
an Englishman in Brazil

Posts: 138
Filters: 8
Quote
Vladimir Golovin wrote:
I'm assigning this to the programmers.Posted: June 26, 2006 5:22 am


Quote
Vladimir Golovin wrote:
Fixed. Posted: June 26, 2006 6:24 am


Wow, bugs fixed in one hour! Think that's one for the Guiness Book!
smile:D

Rô
_________________________________
My favourite question is "Why?".
My second favourite is "Why not?"
Posted: June 26, 2006 9:08 pm   Details E-Mail

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