Topic: smoth curve

[Jean Pierre]

Hi

If I remember, there is a formula to trace a curve wich approximate a zig zag ing curve. They use it in finance and else.

That would be a nice feature.  I think . . .

[curvemeister]

Do you mean a curve that zigs and zags between points in a straight line?  It this will fix the economy, or have some usefulness for good images, cette une bonne idea!

[Jean Pierre]

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[curvemeister]

Yes, this feature could be added to Curvemeister.  I would need to be convinced that it is actually useful in a practical sense.  Each of those corners will show up as banding in a normal image. 

Photoshop can do this, by the way, by clicking on the curve's pencil icon and then shift-clicking on the curve to define straight lines.  Here's a gradient, showing the banded effect from even a fairly mild set of straight lines.

[Greg Groess]

Question....

Would this be a switchable option??  I kind of like the ability to set up a pretty sharp dog leg curve once in a while....

Greg

[Jean Pierre]

It does not remove or replace the curve it smoothes the curve. Dogleg or else.

[Greg Groess]

Yes but if that is true, then I lose correction that I might just want a sharp bend in the curve for. 
I would be back to an average correction rather than my hard fought dog leg.  It might smooth the middle of the curve quite nicely but at the extreme ends I might just want a nice sharp bend.

Greg

[curvemeister]

Food for thought - another use would be when splitting the a and b channels, using separate curves on them.

[Jean Pierre]

Yes but if that is true, then I lose correction that I might just want a sharp bend in the curve for. 
I would be back to an average correction rather than my hard fought dog leg.  It might smooth the middle of the curve quite nicely but at the extreme ends I might just want a nice sharp bend.

Greg

In that case you just dont use it ;-)

[Greg Groess]

True enough Jean...

The original question was would this be switchable....all that being said....

[curvemeister]

So, a way to make a point in the middle of the curve behave like an end point, in the sense that it has a sharp bend, rather than a curve that blends in with adjacent points.  This is essentially what the lizard tail is trying to do by adding multiple points, and I often use the corner fill feature to do a lizard tail for the shadow and highlight.

BTW, the hue curve has the opposite problem.  It would be nice to get rid of the break that happens between 0 and 360, so that there is no abrupt break in hue at that point.

[Jean Pierre]

Photoshop can do this, by the way, by clicking on the curve's pencil icon and then shift-clicking on the curve to define straight lines. 

I forgot about that.