Alchemie foto\grafiche wrote:

'd be interested to know of any such plugin too. I have a number of images with directional camera shake that Refocus fails to handle at all well.

did you try convolution matrix ( in Filter/Generic)

No. I'll have to have a closer look at that, thanks.

Doug

I have been having a heck of a time trying to shrink my screenshots to smaller pics without making them look very VERY fuzzy and unfocused. What can a rather unexperienced user of GIMP do to help avoid this when attempting to resize pictures?

Thank you in advance... Andrea
hexandrea1@yahoo.com

_____________________________________

Andrea Linville wrote:

I have been having a heck of a time trying to shrink my screenshots to smaller pics without making them look very VERY fuzzy and unfocused. What can a rather unexperienced user of GIMP do to help avoid this when attempting to resize pictures?

Thank you in advance... Andrea
hexandrea1@yahoo.com

_____________________________________

shrinking images always involves some form of smoothing, and some amount of sharpening afterwards is generally useful. i usually do this:

[Image] -> [Scale Image...]

in the dialog set widths Quality interpolation -> Cubic (Best)

i think the interpolation method (linear versus cubic) is probably not critical for shrinking an image, but don't select "none."

then once the image is scaled:

[Filters] -> [Enhance] -> [Unsharp Mask...]

then in Unsharp Mask:

Radius: 0.1 Amount: 0.50 to 1.00
Threshold: 0

use the Preview checkbox to compare before/after. beware: excess Amounts sometimes make the image seen snappier at first glance, but have a cheap videotape look to them compared with the original.

i found this set of pages very helpful when i was starting to work with scanners and such.

http://www.scantips.com/simple6.html

good luck.

-rei

On Feb24 15:46, Martin Nordholts wrote:

Andrea Linville wrote:

I have been having a heck of a time trying to shrink my screenshots to smaller pics without making them look very VERY fuzzy and unfocused. What can a rather unexperienced user of GIMP do to help avoid this when attempting to resize pictures?

Thank you in advance... Andrea
hexandrea1@yahoo.com

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Hi

It is often enough to just Filter -> Enhance -> Sharpen... after scaling down to make the scaled down version look much better.

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Alchemie foto\grafiche wrote:

'd be interested to know of any such plugin too. I have a number of images with directional camera shake that Refocus fails to handle at all well.

did you try convolution matrix ( in Filter/Generic)

That applies the convolution to the image. In this case I want to reverse the process - which is a lot harder to do and has been the subject of many papers. Of all the approaches I've seen, I've been most impressed with the Maximum Entropy approaches to deconvolution - however, those require a reasonable guess at the original convolution function (prior).

Cheers,
Toby Haynes

Toby Haynes wrote:

Alchemie foto\grafiche wrote:

'd be interested to know of any such plugin too. I have a number of images with directional camera shake that Refocus fails to handle at all well.

did you try convolution matrix ( in Filter/Generic)

That applies the convolution to the image. In this case I want to reverse the process - which is a lot harder to do and has been the subject of many papers. Of all the approaches I've seen, I've been most impressed with the Maximum Entropy approaches to deconvolution - however, those require a reasonable guess at the original convolution function (prior).

Cheers,
Toby Haynes
______________________________________________

That would be completely beyond me, unfortunately! Cheers,
Doug

Rei Shinozuka writes:

shrinking images always involves some form of smoothing, and some amount of sharpening afterwards is generally useful. i usually do this:

Shrinking of screenshots is generally problematic as there are probably many features on there that are only 1 pixel wide (lines and text). If you scale that down it is doomed to look ugly.

A 1 pixel wide black line on white background will end up gray if scaled down. Sharpening can improve that.

A small font where every pixel counts will be unreadable and no sharpening can recover that.

What are the images for?

Matthias