Search found 188 matches

by henrywho
2012-05-15T18:39:38-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

The downsizings of this very image found at http://web.cs.laurentian.ca/nrobidoux/misc/windmill/ are not enough? Nono... I mean that the brickwall image from Wikipedia is too blurry and not challenging at all for ImageMagick. Actually, any software failed on that image should be eliminated from Ear...
by henrywho
2012-05-15T17:32:00-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

The photo "Moire_pattern_of_bricks.jpg" is too blurry (or is ImageMagick too capable?)

We need sharper patterns, such as the brick walls on "7640_CO40_FM1-175pct_sRGB.jpg".
by henrywho
2012-05-14T16:46:20-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

As for upsize, tritical@doom9 has been maintaining an intra-field only deinterlacer which can be used as a video upsizer (http://forum.doom9.org/showthread.php?t=147695). Sample images at: http://forum.doom9.org/showthread.php?p=1482017#post1482017 http://forum.doom9.org/showthread.php?p=1481498#pos...
by henrywho
2012-05-14T07:29:44-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

Do you mean "-quality 99% -sampling-factor 1:1:1" ? I was always thinking if there is any JPEG library which takes advantage of 16-bit input to produce higher quality output at a smaller size (just like x264's Hi10P). BTW, would you mind telling us the settings for JincJinc4Radius and Jinc...
by henrywho
2012-05-14T04:00:26-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

but the windmill nobody likes the house bricks in the linear light version... I prefer the linear light version because it is really what I saw at six feet away from the screen showing the original photo at 1:1. And I actually hesitate calling the pattern "generated" by EWA-Catrom as &quo...
by henrywho
2012-05-14T01:30:26-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

Pictus wrote:I am enjoying the sharpness of EWA Catrom, sadly it is not 100% moiré free as we can see in the backpack center strip and in the house wall.
Any comment on EWA-Lagrange or EWA-SincSinc2?
by henrywho
2012-05-13T19:59:46-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

henrywho wrote:The colors in Jinc4Sharpest.png are completely wrong.
No such problem if I download the png file and view it from my harddisk. It's weird. :?
by henrywho
2012-05-13T16:41:31-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

The colors in Jinc4Sharpest.png are completely wrong. What is the command you used?

I would categorize such coloration as a bug.
by henrywho
2012-05-13T16:38:33-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

NicolasRobidoux wrote:@Henry: Could you let me know if it's OK that I posted these images? If not, I'll remove them.
It is a sample photo I read from that website. So it's under their copyright. I think it is better to post the original URL and the processing command-lines, instead of the processed files.
by henrywho
2012-05-13T09:45:30-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

In linear light with this black point, the vertical stripes have values 0 0 0 0 0 1 4 9 16. In "sRGB" (remember that encoding uses the reciprocal of gamma), the values are 0 0 0 0 0 1 2 3 4. After pushing the shadow, those dark details are clipped as zero and lost (we do not have negative...
by henrywho
2012-05-13T07:52:57-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

'Tis the time to set me straight, guys! What do you like? Test cases (all downsized to 1000 on the longest side) are: Backpack: http://dcfever.com/cameras/viewsamples.php?set=738&picture=6967 RockBeach: http://dcfever.com/cameras/viewsamples.php?set=632&picture=5587 Bike: http://dcfever.com...
by henrywho
2012-05-12T22:54:21-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

Which one? What you call JincJinc3 (which is the "improved" version of the current EWA LanczosSharp, with a blur barely below 1)? Over/strong-sharpening downsampler means EWA-Lagrange, not JincJincSharpest3 or 4. BTW, orthogonal box (odd integer ratio) downsizing of real life photos like ...
by henrywho
2012-05-12T10:12:44-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

If you feel adventurous, could you please try EWA Sinc-windowed Sinc 2, 3 and 4 (which you need to drive using defines because ImageMagick silently swaps Jinc for Sinc with EWA unless you "hardwire Sinc")? Do you mean " ... -define filter:filter=Sinc -define filter:window=Sinc -defin...
by henrywho
2012-05-12T07:06:36-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

Another interesting sample at http://www.dcfever.com/cameras/viewsamp ... cture=6978

The red grids on the robot's chest and the gold solder points on the PCB are de-colored which I suspect being an artifact of USM. Over-sharpening EWA downsample does not have this problem.
by henrywho
2012-05-12T03:44:49-07:00
Forum: Users
Topic: best downsampling method for DSLR photographs
Replies: 273
Views: 473956

Re: best downsampling method for DSLR photographs

RE: Using EWA (-distort Resize) with Lagrange or Catrom http://forums.dpreview.com/forums/read.asp?forum=1006&message=41366611: Although I've never tried it, I would be very very surprised if this consistently gives good results. I suggested the original poster trying EWA Catrom because his &qu...