Chrysanthemum sp.

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Chrysanthemum sp.

Unread postby Juza » 02.09.2004 19:09

Image

Taken with Nikon D70.

Post processing : saturation, sharpening, halo remotion.

This time I had to fight with a green halo ;-)

(you can see the photo before the halo remotion here--->
http://www.juzaphoto.com/npn/halo_116.jpg )
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Unread postby Dan Kozub » 05.09.2004 10:00

Great colors, Juza!

How do you remove halos?

In the next version I'll include white halo suppression. Can you send me a crop from this picture before sharpeing? I will try to process it with Helicon Filter sharpening and will publish it here to compare.

Dan
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Unread postby Juza » 05.09.2004 17:39

Hi Dan,
I remove the halos "manually" with the pencil tool of Windows' Paint...a slow process, but it works ;-)

This is the not sharpened copy :

http://www.juzaphoto.com/npn/juza_red-flower.jpg
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Unread postby Dan Kozub » 05.09.2004 19:13

Juza,

Here is my try:

Befor shparpening:

Image

White halos reduced by 50%:
Image

White halos reduced by 100%:
Image


Settings: Intensity=10, edge width=2, min edge contrast = 100%
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Unread postby Juza » 06.09.2004 01:04

The halo reduction works well(the halo has disappeared), but the image looks a bit softer than mine(see magnified crops : http://www.juzaphoto.com/npn/halo_hnf_01.jpg )...there can be various reasons :

- noise filtering
The original image was taken at the lowest ISO value of my D70 and it was very noise clean; moreover it has been slightly blurred in the process of resizing it from 6 megapixel to the 640x428 web version, so the "not sharpened copy" was really noiseless. If you applied some noise filtering it could have diminished the detail.

- amount of sharpnening
Mayble you have used a little less sharpening than me

- halo reduction
the halo red. algorithm might have reduced sharpness?
I think that the best test might be to try the halo reduction with the already sharpened image (to avoid the uncertainties about the amount of sharpnening) and with all the other functions (noise reduction, color,etc.) turned off.

You can download the sharpened image here:

http://www.juzaphoto.com/npn/sharpened.zip
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