ImageMagick: Unsharp parameters limited

[Aqua2102]

Hi,

I did a little spreadsheet experimenting to find out optimum ImageMagick unsharp parameters. For my purposes, it turned out that I prefer

Radius = 0.8, Sigma = 0.8, Amount = 0.6, Threshold = 0.0

I entered the values in EE in the sharpening configuration line for resize methods. However, when I click update, EE changes the entered values. Obviously the "Amount" value is restricted to integers and the threshold value cannot be set to zero.

Any solution to this?

Cheers

[DeadKenny]

I've run into this myself, though I'm not too sure what settings to use. I've been trying what I think is the ImageMagick equivalent of what I use in Photoshop based on this article...

http://redskiesatnight.com/Articles/IMsharpen/


However another problem I've got is what I think are the equivalent settings that work well in Photoshop just appear to make no difference with ImageMagick.

e.g. After I've got my final image at full size and sharpened, I want to reduce it to 800 pixels on the longest edge and when I do it looks soft so I need to sharpen further. In Photoshop I use an amount of 50%, radius of 1 and threshold of 0. From the above article I get the impression ImageMagick settings should be amount 0.5, radius 1 and threshold 0. Now I can't enter 0.5 as the amount in EE but even if I set it to 1 which should be harsh (equivalent to 100%?), I see no difference so all my 'normal' sized images look a little soft. I'm not even sure what sigma should be.