----- David said: --------------
Try the Unsharp Mask filter: Filters > Enhance > Unsharp Mask. I saw a similar function in Photoshop, but I don't know how the three controls interact -- or even what each control's effect is supposed to be... The default settings (right after GIMP's installation) seem to alter fractal images a bit too much.
So, when features in an image occasionally appear to need a touch of sharpening, I've been using low (e. g. 20) settings of the single control: Filters > Enhance > Sharpen... I guess it's a filter with training wheels for noobs. ;P But, amazingly, many of the Lanczos down-sampled images don't really appear to need any sharpening at all -- especially if I render them at 5X the final image size. Can you tell me (or point me to a page) how the three Unsharp Mask controls work? I read the GIMP Help, but I'm not sure if the assumptions and procedures for sharpening real world photography hold for our fractals... - Hal Lane ######################## # hallane@earthlink.net ######################## -----Original Message----- From: Fractint [mailto:fractint-bounces@mailman.xmission.com] On Behalf Of david Sent: Tuesday, May 24, 2016 4:35 AM To: Fractint and General Fractals Discussion <fractint@mailman.xmission.com> Subject: Re: [Fractint] FOTX -- May 22, 2016 I use GIMP all the time, being of sound Linux mind ;). And the Lanczos setting for image resizes. Try the Unsharp Mask filter: Filters > Enhance > Unsharp Mask. You might like the results. Thanks for the images, now just need to start rendering them at full Fractint max size, downsample to 25%, and print posters! On 05/23/2016 04:33 PM, Harold Lane wrote:
The late Paul N. Lee suggested I try the image processing program GIMP. I had not tried GIMP until my anti-aliasing results in Photoshop (using their best down-sampling algorithm -- "Bi-cubic sharper") on this Win 8.1 computer came out poorer quality than the Lanczos algorithm used in my not-supported (on Win 8.1) image processing program I had used on my Win-XP computer: "CompuPic".
GIMP *has* the Lanczos algorithm, and I have used it on this set of my investigations of Jim's FOTX -- May 22, 2016 image. I followed the Lanczos down-sampling with a small amount of sharpening to attempt to remove some of the "softness" of edges created by that algorithm.
I like the results much better.
I'm not yet familiar with GIMP and inadvertently left the default "Progressive" checkbox checked, so the JPG images appear in three "waves" of increasing resolution. I'll try and remember to uncheck that box for the next set of images.
-- David W. Jones gnome@hawaii.rr.com authenticity, honesty, community http://dancingtreefrog.com _______________________________________________ Fractint mailing list Fractint@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/fractint --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus