On 03/09/2010 04:39 PM, Jon Senior wrote:
> On Tue, 09 Mar 2010 16:30:58 -0500
> Jay Smith <j...@jaysmith.com> wrote:
>> I am not sure where the "standard" that you mention comes from.  I had
>> never seen black at bottom left (by default) until I started to use
>> Gimp.
>> Is there some actual scientific standard underlying that?  Or just
>> majority of programs?  Or the programs you have used?  Or?
>> Maybe the programs I have used in the past were backward.
> I would suggest that they were. The "curves" are graphs plotting value
> in (x) against value out(y). Traditionally a graph starting at 0 for
> both axes would be drawn with the origin in the bottom-left.
> This naturally leads to a curves graph where black (0) is in the
> bottom-left and white (255/1023/...) is in the top-right.
> What programs have you used where this situation was reversed?
> Jon


That is certainly possible.

The one that most comes to mind is Photoshop 5.x.

I have no idea what "modern" Photoshop and successors do.

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