Curves Adjustment : coordinates of the points of the curve

[Sébastien]

Hello,

Thank you for your wonderfull (and inexpensive) software.

One of my photography practice is producing paper prints using alternative process, such as VanDyke brown process. For that pupose, I first need to print negative pictures using a specific Curve Adjustment Profile. Each point of my profile has been precisely determined (x,y coordinates in the range 0-255) in accordance with my process.

I didn't found in Affinity Photo how to set precisely the coordinates of the points of a Curve Adjustment.

Is there a way to do that ?

If not, is it planned to add such a feature in Affinity photo ?

Regards,

Sébastien

[Old Bruce]

Hi and welcome to the forums Sebastien,

5 hours ago, Sébastien said:

One of my photography practice is producing paper prints using alternative process, such as VanDyke brown process. For that pupose, I first need to print negative pictures using a specific Curve Adjustment Profile. Each point of my profile has been precisely determined (x,y coordinates in the range 0-255) in accordance with my process.

I didn't found in Affinity Photo how to set precisely the coordinates of the points of a Curve Adjustment.

Is there a way to do that ?

If not, is it planned to add such a feature in Affinity photo ?

 

Sadly we cannot set the curve breakpoints numerically. We can save presets of curves, but if you first need to create them using numeric input, as opposed to the current method of going by eye, then you are out of luck.

[Clau_S]

I resume this topic not to open a new one on the same subject. I know that curve nodes precise editing has been added in 1.9 and I was happy with it until I found the awkward range of values from 0(.000) to 1(.000). Affinity Photo help recommends to use it for precision 32-bit linear workflows, but actually it's totally useless for me. I mean, curves are still a powerful tool to match colors in an old fashioned 8-bit workflow, and adding coordinates would be the fastest way if x and y values could be expressed in 0-255 values too. Having only this range from 0 to 1 makes no sense to me or is limiting at least. I still have to rely on color readouts or to rely on math, time consuming anyway.