Search found 188 matches
- 2012-07-06T22:27:04-07:00
- Forum: Digital Image Processing
- Topic: Image resizing with LCD sub-pixel awareness (aka ClearType)
- Replies: 18
- Views: 80602
Re: Image resizing with LCD sub-pixel awareness (aka ClearTy
I wanna try testing with this concept. Using the sample image at http://forums.dpreview.com/forums/read.asp?forum=1006&message=40282142 the anti-aliasing effect seems not easily noticeable. convert.exe 7640_CO40_FM1-175pct_sRGB.jpg -colorspace RGB -filter RobidouxSharp -distort resize 1800x900! ...
- 2012-06-19T04:55:46-07:00
- Forum: Digital Image Processing
- Topic: [SOLVED] Donate a high quality raw image to science?
- Replies: 67
- Views: 158677
Re: [SOLVED] Donate a high quality raw image to science?
Do you have any tool to demosaic the RAW samples at
http://www.fotopolis.pl/index.php?n=14580&p=1
P.S. The landscape sample seems nice (http://www.dpreview.com/reviews/nikon-d800-d800e/27)
http://www.fotopolis.pl/index.php?n=14580&p=1
P.S. The landscape sample seems nice (http://www.dpreview.com/reviews/nikon-d800-d800e/27)
- 2012-06-04T03:58:06-07:00
- Forum: Digital Image Processing
- Topic: [SOLVED] Donate a high quality raw image to science?
- Replies: 67
- Views: 158677
Re: [SOLVED] Donate a high quality raw image to science?
"-q 1" is VNG ... um....
http://www.libraw.org/articles/bayer-moire.html
Perhaps rawtherapee with LMMSE or AMaZE using "neutral" BW? It seems to have linux binary distributions.
http://www.libraw.org/articles/bayer-moire.html
Perhaps rawtherapee with LMMSE or AMaZE using "neutral" BW? It seems to have linux binary distributions.
- 2012-06-03T01:21:16-07:00
- Forum: Digital Image Processing
- Topic: [SOLVED] Donate a high quality raw image to science?
- Replies: 67
- Views: 158677
Re: [SOLVED] Donate a high quality raw image to science?
Actually, the color of "apartment.tif" is a bit off, kinda green-cast there. What something like: LibRaw-0.14.6\bin\dcraw_emu.exe -w +M -H 2 -fbdd 1 -dcbe -q 10 -o 1 -g 1 1 -6 apartment.rw2 ImageMagick\convert.exe apartment.rw2.ppm -set colorspace sRGB -crop 2520x2520+530+1249 +repage -def...
- 2012-05-29T18:22:19-07:00
- Forum: Users
- Topic: best downsampling method for DSLR photographs
- Replies: 273
- Views: 475233
Re: best downsampling method for DSLR photographs
That "whitepaper" is for marketing guys, nothing technical
I tend to believe that they are re-using the quick resample routine (the one for realtime display and "pureview" digital zoom) for that "oversampling" task, giving the sub-par results.
I tend to believe that they are re-using the quick resample routine (the one for realtime display and "pureview" digital zoom) for that "oversampling" task, giving the sub-par results.
- 2012-05-29T05:36:19-07:00
- Forum: Users
- Topic: best downsampling method for DSLR photographs
- Replies: 273
- Views: 475233
Re: best downsampling method for DSLR photographs
[duplicate post deleted]
- 2012-05-29T05:08:51-07:00
- Forum: Users
- Topic: best downsampling method for DSLR photographs
- Replies: 273
- Views: 475233
Re: best downsampling method for DSLR photographs
Conjecture With my favorite methods, no negative total weight can occur. as long as that there is no programming or compiler bugs (or different rounding conventions, etc.) 8) btw, though not DSLR, Nokia is introducing a 41MP mobile phone with a 1/1.2" sensor. :shock: Information and samples at...
- 2012-05-20T21:39:56-07:00
- Forum: Users
- Topic: raw to JPEG conversion
- Replies: 3
- Views: 11597
Re: raw to JPEG conversion
ImageMagick seems to be converting raw files with the bundled dcraw 9.06 which is a bit too old.
You may want to take a look at the dcraw "clone" in LibRaw (http://www.libraw.org/download) which has more demosaic and denoise methods.
You may want to take a look at the dcraw "clone" in LibRaw (http://www.libraw.org/download) which has more demosaic and denoise methods.
- 2012-05-20T17:18:26-07:00
- Forum: Users
- Topic: best downsampling method for DSLR photographs
- Replies: 273
- Views: 475233
Re: best downsampling method for DSLR photographs
But if what you say is true, why not use an even more extreme gamma change on both ends rather than just the .45455 and inverse built into sRGB? Does that make any sense? I just find linear light downsize produces images that match better (brightness wise) to viewing the original 1:1 image a few fe...
- 2012-05-20T07:59:57-07:00
- Forum: Users
- Topic: best downsampling method for DSLR photographs
- Replies: 273
- Views: 475233
Re: best downsampling method for DSLR photographs
In my testes, images with heavy PP(post processing) have a tendency to be worst when using linear light due to the fact that the PP may already have enhanced the details... I tend to take a simpler explanation. Artifacts are unwanted patterns formed by interpolated values generated by resizers. The...
- 2012-05-20T04:56:59-07:00
- Forum: Users
- Topic: best downsampling method for DSLR photographs
- Replies: 273
- Views: 475233
Re: best downsampling method for DSLR photographs
Aren't these blur values designed for distort resize?Pictus wrote:convert BackPack.png -filter Lanczos -define filter:lobes=4 -define filter:blur=0.88451002338585141 -resize 1200x1200 Lanczos_4.png
....
- 2012-05-19T09:50:00-07:00
- Forum: Users
- Topic: best downsampling method for DSLR photographs
- Replies: 273
- Views: 475233
Re: best downsampling method for DSLR photographs
No, it's the image itself, containing high contrast sharp lines. I tried sizing it down by 50% and then up by 2X, the lines become awful.NicolasRobidoux wrote:Do you see problems with the downsample of the apartments image I put in the test image bank? If you do (please explain), I may redo it.
- 2012-05-19T09:41:14-07:00
- Forum: Users
- Topic: best downsampling method for DSLR photographs
- Replies: 273
- Views: 475233
Re: best downsampling method for DSLR photographs
I think the range from EWA-Robidoux to EWA-Catrom should cover most uses.Pictus wrote:use some contrast detect algorithm to choose the good one...
- 2012-05-18T22:31:23-07:00
- Forum: Users
- Topic: best downsampling method for DSLR photographs
- Replies: 273
- Views: 475233
Re: best downsampling method for DSLR photographs
P.S. I just checked: Indeed box filtering by 3 of a crop to multiples of 3 in both directions shows moire. I'm really happy now that none of the images in the test image bank I prepared is moire prone. But apartment.tif is alias-prone. 8) P.S. 2 Henry, I am truly very thankful for all your feedback...
- 2012-05-16T17:29:34-07:00
- Forum: Users
- Topic: best downsampling method for DSLR photographs
- Replies: 273
- Views: 475233
Re: best downsampling method for DSLR photographs
I remember that cubic calculation are quite a bit faster than, e.g. Jinc, for EWA, right? The time needed for such search should be acceptable. Indeed, the sharper the source, the less sharp the downsizer should be. If we have some algorithm to evaluate the sharpness, can we have some automatic calc...