It probably should be using -intensity.
also rather than necro-posting you should have started a new post.
I am splitting the post into a separate topic.
Search found 8887 matches
- 2017-11-30T16:35:25-07:00
- Forum: Users
- Topic: why is median of a sequence of images slower than mean
- Replies: 13
- Views: 19911
- 2017-11-23T16:34:06-07:00
- Forum: MagickWand for PHP
- Topic: Transparent colour goes black when png/gif resized and conve
- Replies: 11
- Views: 148631
Re: Transparent colour goes black when png/gif resized and conve
Better still look at which has a number of different examples of the problem and how to fix it/ IM Usage Examples, Removing Transparency from Images http://www.imagemagick.org/Usage/masking/#remove The section of example immediately above that introduces the -alpha image processing operators. Also t...
- 2017-11-19T18:15:46-07:00
- Forum: Users
- Topic: Compare -FUZZ <- how it is calculated
- Replies: 20
- Views: 26929
Re: Compare -FUZZ <- how it is calculated
Hmmm one side effect of -metric PAE. if you compare any image to another that is the same size but all black PAE will get you the largest color value in the image. On the other hand MAE will get you the average of all the color values in the image. Note this is over ALL color channels. A -metric FUZ...
- 2017-11-19T18:05:37-07:00
- Forum: Users
- Topic: Compare -FUZZ <- how it is calculated
- Replies: 20
- Views: 26929
Re: Compare -FUZZ <- how it is calculated
If I use an extrememly high fuzz factor of 82% (larger that the .81 value we had before), then black and cyan SHOULD be the same! [b]compare xc:black xc:cyan -metric AE -fuzz 82% null:[/b] 1 As you can see I have the WRONG result! Something is not correct, and I will be report this though it may be...
- 2017-11-16T17:52:16-07:00
- Forum: Users
- Topic: Compare -FUZZ <- how it is calculated
- Replies: 20
- Views: 26929
Re: Compare -FUZZ <- how it is calculated
The -metric AE is completely different to PAE. AE only returns a boolean (error or not-error) result, returning total count of the number of different pixels. So normally is ANY pixel is different it is different! [b]compare xc:black xc:cyan -metric AE null:[/b] 1 However AE is one of the few metric...
- 2017-11-13T21:38:34-07:00
- Forum: Users
- Topic: Compare -FUZZ <- how it is calculated
- Replies: 20
- Views: 26929
Re: Compare -FUZZ <- how it is calculated
Internally IM uses its compile time quaility setting. 8 bit images are stored at that quality and then saves at the current image 'depth' whcih is usualy the image input depth. Also HDRI versions of IM store values a floating poitn numbers in memory but use Q16 as a base for those numbers. EG typica...
- 2017-11-12T21:01:58-07:00
- Forum: Users
- Topic: No consistent effect across different resolutions
- Replies: 12
- Views: 12148
Re: No consistent effect across different resolutions
Since your 1080 image is larger than your 540 by about 2 in height, have you tried <threshold map="hlines4x2a"> <description>Horizontal Lines 4x2 (bounds adjusted)</description> <levels width="4" height="2" divisor="10"> 3 3 3 3 9 9 9 9 </levels> </threshold>...
- 2017-11-12T17:59:16-07:00
- Forum: Users
- Topic: No consistent effect across different resolutions
- Replies: 12
- Views: 12148
Re: No consistent effect across different resolutions
Dithering is a pixel level process, and as such is dependant of the resolution of the image. There is not a lot you can do about that. Also colors that are being dithered can be effected by the resize operations, becoming smoother at lower resolutions, which makes dither work differently at pixel le...
- 2017-11-12T16:51:14-07:00
- Forum: Users
- Topic: Compare -FUZZ <- how it is calculated
- Replies: 20
- Views: 26929
Re: Compare -FUZZ <- how it is calculated
Actually without a percentage Fuzz defines that sphere in terms of pixel value distance. But while Fuzz is a sphere for opaque RGB values it is a lot more complex when transparency is involved. The sphere remains the same but the distance between the pixels gets closer as the pixles become more tran...
- 2017-11-09T16:35:20-07:00
- Forum: Users
- Topic: How to dirty a font
- Replies: 20
- Views: 31214
Re: How to dirty a font
opps my bad.. I removed the xc: from the example.. The lightblue did not matter because of the threshold so I removed some of the useless options and went a little too far. Example is now... convert -size 320x100 xc: \ -font Candice -pointsize 72 -annotate +25+65 'Anthony' \ -spread 1 -blur 0x1 -thr...
- 2017-11-08T19:26:23-07:00
- Forum: Users
- Topic: adding text to just one page of a multiple page TIFF
- Replies: 9
- Views: 10760
Re: adding text to just one page of a multiple page TIFF
Gif Animation Modifications is a good away to see how to handle multiple pages
http://www.imagemagick.org/Usage/anim_mods/#frame_mod
http://www.imagemagick.org/Usage/anim_mods/#frame_mod
- 2017-11-08T18:51:52-07:00
- Forum: Users
- Topic: How to dirty a font
- Replies: 20
- Views: 31214
Re: How to dirty a font
Added the simpler spread technique to "Compound Fonts" section of IM Examples http://www.imagemagick.org/Usage/fonts/#dirty_print May take a hour or so to appear online. The Compound Fonts Section is one of the oldest of ImageMagick Examples, and basically explores simple techniques of mod...
- 2017-11-08T16:33:43-07:00
- Forum: Users
- Topic: Cropping unknown amount from left edge to leave a given-width image
- Replies: 7
- Views: 10137
Re: Cropping unknown amount from left edge to leave a given-width image
The biggest difference between -extent and -crop is that -extent will not only crop an image but expand it to. That is if the image was smaller than 1220 pixels, it will expand the image by 1220 pixels, that is why it needs to 'overlay' the image onto a background. Crop on the other hand will NEVER ...
- 2017-09-27T18:11:13-07:00
- Forum: Users
- Topic: optimizing 'convert' speed
- Replies: 5
- Views: 15221
Re: optimizing 'convert' speed
Also using -depth 8 will have no effect on run time. It is only used to specify the output save depth, and that defaults to the images input depth (probably already 8 bit. To get a speed improvement (with a loss in quality though not for this type of command) you want to change the compile time &quo...
- 2017-09-20T23:30:38-07:00
- Forum: Users
- Topic: Alternative to "-morphology dilate octagon".
- Replies: 11
- Views: 12351
Re: Alternative to "-morphology dilate octagon".
Convolve and Simple Morpholgy are essentually applied by the same routines, UNLESS they somehow invooke GPU's to do the function. The simple reason -morpohology dialate:30 octagon is faster than -morpohology dialate octagon:61 is that it applies a vastly smaller kernel 30 times rather than one very ...