Search found 75 matches
- 2014-07-31T00:33:41-07:00
- Forum: Users
- Topic: Q8 vs. Q16 speed (& hdri)
- Replies: 15
- Views: 33281
Re: Q8 vs. Q16 speed (& hdri)
I believe they are mostly talking about memory. Disk space is also affected as you now have 16 bit per channel images rather than 8-bits per channel. Fyi: I found another bit of information on this on http://www.imagemagick.org/script/advanced-unix-installation.php Larger pixel quantums can cause I...
- 2014-07-30T13:10:59-07:00
- Forum: Users
- Topic: Q8 vs. Q16 speed (& hdri)
- Replies: 15
- Views: 33281
Re: Q8 vs. Q16 speed (& hdri)
I have never done speed trials of Q8 vs Q16 vs Q32, or integer vs HDRI. I'm not aware of anyone else having done this. I would be interested in any results. Right, that would the reason why the description on the IM download page about these versions is so fuzzy: "A Q16 version permits you to ...
- 2014-07-30T12:18:53-07:00
- Forum: Users
- Topic: Q8 vs. Q16 speed (& hdri)
- Replies: 15
- Views: 33281
Q8 vs. Q16 speed (& hdri)
Problem: As a simple user, I'm wondering if it's "worth it" to keep two IM versions around - one q8 for speed, one q16 for 48bpp images. I'm on a 2ghz dual-core 4gb ram laptop, so I'm not *that* worried about memory usage like maybe a webserver is. I'm using IM to watermark images and cre...
- 2014-07-16T10:09:49-07:00
- Forum: Developers
- Topic: Req: fix for clipping on negative polaroid geometry
- Replies: 0
- Views: 3553
Req: fix for clipping on negative polaroid geometry
I hope I hit the correct place for this feature request, if not sorry and feel free to move this thread :-o Problem : I'm currently generating (very nice, btw) multi-line(!) polaroid thumbnails. To make it look less structured and esp. make better use of the space I'm using a minor negative -geometr...
- 2014-06-19T03:21:08-07:00
- Forum: Users
- Topic: Source vs downsampling vs output sharpening?
- Replies: 3
- Views: 6723
Re: Source vs downsampling vs output sharpening?
Some people say you should do a little sharpening as the first operation, before shifting tones/hues etc. Until recently, I did this. Meaning you don't do it anymore ... why's that? Too much processing power for too little of a result? Or artifacts in certain constellations vs. pure output sharpeni...
- 2014-06-19T02:35:29-07:00
- Forum: Users
- Topic: Source vs downsampling vs output sharpening?
- Replies: 3
- Views: 6723
Source vs downsampling vs output sharpening?
I have always been puzzled by this and never found a conclusive answer in the general photography forums: When do I apply what amount of sharpening? The possibilities are: 1. before downsizing (esp. Lightroom/PS with ACR since it has access to the original raw bayer pattern and can adapt to the came...
- 2014-06-18T03:23:50-07:00
- Forum: Users
- Topic: Content-aware image extent?
- Replies: 4
- Views: 6367
Re: Content-aware image extent?
Right, thanks, that's it! You can run *nix shell scripts on Windows through cygwin (or msys/mingw) bash just fine btw.fmw42 wrote:If on unix, see my script imageborder at the link below
- 2014-06-17T12:59:09-07:00
- Forum: Users
- Topic: Content-aware image extent?
- Replies: 4
- Views: 6367
Content-aware image extent?
I'd like to add a alpha-masked border around my images, but without cutting too much into the original content. The idea is to inconspicuously extent the outer content of the image to an added border - basically what you would do in Photoshop with extent canvas and context-sensitive fill. Of course ...
- 2014-06-14T09:31:52-07:00
- Forum: Users
- Topic: How to fx a (pref. non-reversible) watermark background?
- Replies: 12
- Views: 13189
Re: How to fx a (pref. non-reversible) watermark background?
I just saw that im also returns the "standard deviation", so that's probably what I should use for the wm strength. I reckon I need to brush up my statistics knowledge... any hints anyone on how to best measure the "noisiness" of an image to compute the watermark background stre...
- 2014-06-14T08:27:58-07:00
- Forum: Users
- Topic: How to fx a (pref. non-reversible) watermark background?
- Replies: 12
- Views: 13189
Re: How to fx a (pref. non-reversible) watermark background?
- provide traceability for stolen images. I looked into that, but couldn't figure out (yet :-)) how the stegano command of im works - and it doesn't seem to work with convert in the same step anyway, so I can just resort to a dedicated program. I definitely want to add this if I post 100% res image...
- 2014-06-14T05:46:35-07:00
- Forum: Users
- Topic: How to fx a (pref. non-reversible) watermark background?
- Replies: 12
- Views: 13189
Re: How to fx a (pref. non-reversible) watermark background?
-alpha set -channel A -evaluate set 50%%[/quote] Ugh, fyi: after running this on some real-life pictures this isn't fit for prime time - it has hard breaks on it and reverses color channels though it should really just work on the luma. The good part is that it works on pure black as well as pure w...
- 2014-06-13T06:11:45-07:00
- Forum: Users
- Topic: How to fx a (pref. non-reversible) watermark background?
- Replies: 12
- Views: 13189
Re: How to fx a (pref. non-reversible) watermark background?
Anything is reversible, in the sense of doing it by hand in Gimp or whatever. Indeed, but you have to know the algorithm and when data loss occurred the reversed image will have less resolution. I just don't want the standard luma watermarked that can be removed by applying the inverse mask. But if...
- 2014-06-12T06:39:29-07:00
- Forum: Users
- Topic: How to fx a (pref. non-reversible) watermark background?
- Replies: 12
- Views: 13189
Re: How to fx a (pref. non-reversible) watermark background?
2. You can adjust the mask, eg by extending it Thanks, I've got it working - looks great: not "off the shelf", rather unobstrusive but still stands out a bit, plus I imagine it's not reversible that easily w/o major artifacts. 3. Doing a darken or lighten, as required, in a single step is...
- 2014-06-12T05:08:02-07:00
- Forum: Users
- Topic: How to fx a (pref. non-reversible) watermark background?
- Replies: 12
- Views: 13189
Re: How to fx a (pref. non-reversible) watermark background?
The possibilities are endless. Yeah, that would be my problem :-p I'm quite fond of this This is a terrific sample, thanks! As to be expected, I have follow-up questions :-p 1. Bug: In your sample script, the -gravity doesn't do anything over here, the watermark is positioned to the northwest whate...
- 2014-06-12T03:39:10-07:00
- Forum: Users
- Topic: How to fx a (pref. non-reversible) watermark background?
- Replies: 12
- Views: 13189
How to fx a (pref. non-reversible) watermark background?
I've written a watermarking batch script that puts a semi-transparent plain overlay in the image, brightening or darkening the background according to the image below. It's done by just soft-light'ing a semi-transparent png. The real watermark image/text gets written on top of that. Problem: I would...