hi there, thank you so much for your energy and for sharing your thoughts! i was looking for gray images, one per channel, technically in the RGB colorspace. but i will look at your suggestion and think about my direction further. thanks again!
- J
Search found 68 matches
- 2014-03-09T17:50:01-07:00
- Forum: Users
- Topic: Outputting Channel Images in RGB
- Replies: 10
- Views: 9547
- 2014-03-08T00:32:19-07:00
- Forum: Users
- Topic: Outputting Channel Images in RGB
- Replies: 10
- Views: 9547
Outputting Channel Images in RGB
I'd like to output separate channel images in RGB format, but can't seem to get what I need: convert input.ext -separate channel_%d.jpg i've tried putting -colorspace RGB after -separate without luck. I understand the separate argument wisely outputs grayscale images; I want to make them RGB and mai...
- 2014-03-01T22:34:14-07:00
- Forum: Developers
- Topic: JPEG quality - from QT tables?
- Replies: 1
- Views: 4108
JPEG quality - from QT tables?
Is the JPEG quality reported by identify based on statistics of the quantization tables, or a metadata report? How reliable is it?
Thanks so much!
J
Thanks so much!
J
- 2014-02-28T16:27:31-07:00
- Forum: Developers
- Topic: Perceptual Hash
- Replies: 31
- Views: 52828
Re: Perceptual Hash
I've just spent the last week studying perceptual hashes and CBIR and such, and have to commend you on your choice of algorithms. Using invariant moments was very wise, in my semi-educated opinion! I'm eager to test this and explore more; please let me know when you release an actual hash creation p...
- 2014-02-24T19:34:36-07:00
- Forum: Developers
- Topic: Possible Bug/New Feature -- Skewness Skewed? Median metric?
- Replies: 2
- Views: 6174
Re: Possible Bug/New Feature -- Skewness Skewed? Median met
I wish I could be of more help. I've done research on this but am not a statistics-savvy person enough to know how to resolve the matter.
Regarding skewness, I have researched the matter and discovered that ImageMagick is reporting the values correctly. False alarm there, so sorry!
J
Regarding skewness, I have researched the matter and discovered that ImageMagick is reporting the values correctly. False alarm there, so sorry!
J
- 2014-02-23T01:22:09-07:00
- Forum: Developers
- Topic: Perceptual Hash
- Replies: 31
- Views: 52828
Re: Perceptual Hash
Thanks for including me, but unfortunately I'm a beginner in many regards and can't help much other than testing, sharing resources, and trying to become more helpful by studying. (I manage and design the development of software but don't code myself often.) It's great to hear that this is on your m...
- 2014-02-22T20:50:58-07:00
- Forum: Users
- Topic: -unique-colors order vs. histogram order
- Replies: 1
- Views: 2742
-unique-colors order vs. histogram order
it would be a great convenience in terms of synchronization for coding, as well as visibly possibly more pleasing, if the order of the -unique-colors operation convert colorbar.gif -unique-colors -depth 8 txt:- was the same as the order in which you receive: convert colorbar.gif -define histogram:un...
- 2014-02-22T19:52:30-07:00
- Forum: Developers
- Topic: Possible Bug/New Feature -- Skewness Skewed? Median metric?
- Replies: 2
- Views: 6174
Possible Bug/New Feature -- Skewness Skewed? Median metric?
I may be mistaken, but i am seeing the skewness measure out of line with the distribution, as if it's opposite (negative switch to positive values). I believe skewness is supposed to be a negative value for skewed left distributions, and positive skewed right, but it seems ImageMagick is returning t...
- 2014-02-22T18:55:56-07:00
- Forum: Developers
- Topic: Perceptual Hash
- Replies: 31
- Views: 52828
- 2014-02-22T18:55:21-07:00
- Forum: Developers
- Topic: Perceptual Hash
- Replies: 31
- Views: 52828
Re: Perceptual Hash
I would bet real cash that you are all very ahead of me on this matter, but I thought in the spirit of collaboration I would share what resources I've come across: http://hackerlabs.org/blog/2012/07/30/organizing-photos-with-duplicate-and-similarity-checking/ http://www.hackerfactor.com/blog/?/archi...
- 2014-02-21T20:25:54-07:00
- Forum: Developers
- Topic: Perceptual Hash
- Replies: 31
- Views: 52828
Perceptual Hash
This is stellar work! You are royalty! I've been studying perceptual hashes and similarity algorithms lately, and this is a fascinating approach. A question - I see this is a metric, and you can compare, and see moments, but I don't see any literal hash generation that is exposed to the user. Ideall...
- 2014-02-21T17:41:12-07:00
- Forum: Users
- Topic: Kurtosis - 0 or 3 is normal?
- Replies: 3
- Views: 4605
Re: Kurtosis - 0 or 3 is normal?
thanks as always, fred! the first definition has the normal distribution as 3 though, and the second one subtracts 3 to make it 0. so, i believe ImageMagick is using the second definition, yes?
J
J
- 2014-02-19T19:58:32-07:00
- Forum: Users
- Topic: Kurtosis - 0 or 3 is normal?
- Replies: 3
- Views: 4605
Kurtosis - 0 or 3 is normal?
is the kurtosis formula in use by identify using 0 or 3 as the normal distribution value?
http://itl.nist.gov/div898/handbook/eda ... eda35b.htm
thank you so much for your attention!!
J
http://itl.nist.gov/div898/handbook/eda ... eda35b.htm
thank you so much for your attention!!
J
- 2014-02-13T18:10:31-07:00
- Forum: Users
- Topic: Identify values between verbose and format
- Replies: 2
- Views: 3289
Re: Identify values between verbose and format
thank you so much!!! : )
J
J
- 2014-02-12T17:44:56-07:00
- Forum: Users
- Topic: Identify values between verbose and format
- Replies: 2
- Views: 3289
Identify values between verbose and format
when i run this
i get a value of
18232.1
but when i run
i see in overall image statistics a standard deviation of 70.9422 (0.278205)
how can i get the value shown in the verbose output?
thanks so much!!
J
Code: Select all
identify -format '%[standard-deviation]' image.jpg
18232.1
but when i run
Code: Select all
identify -verbose image.jpg
how can i get the value shown in the verbose output?
thanks so much!!
J