Bold Table Bars Removal using ImageMagick - image-processing
I have an Invoice Image which contains table bars as below example.
I am using ImageMagick to pre-process Images using the below command.
convert 0.png -type Grayscale -negate -define morphology:compose=darken -morphology Thinning 'Rectangle:1x80+0+0<' -negate 0.png
My Problem is that output with horizontal bold bars. ImageMagick fails to convert it correctly and output as below.
What can I do to solve this?
Here is a different way using ImageMagick and connected components. First trim the image to remove the outer white, then use connected components to get the id of the largest black region, which should be id=0. The run it again removing the id of the largest area making it transparent and finally flattening the result against white. Then add the thinning operation to remove the horizontal lines that were not fully black. See https://imagemagick.org/script/connected-components.php
convert image.png -fuzz 5% -trim +repage \
-bordercolor black -border 1 \
-define connected-components:verbose=true \
-define connected-components:mean-color=true \
-connected-components 4 \
null:
Objects (id: bounding-box centroid area mean-color):
0: 953x205+0+0 478.7,65.6 31513 srgba(0,0,0,1)
10789: 943x19+5+184 488.4,193.1 16885 srgba(255,255,255,1)
1: 465x17+5+1 237.0,9.0 7905 srgba(255,255,255,1)
2: 474x17+474+1 733.5,9.0 7096 srgba(255,255,255,1)
3820: 281x21+667+67 807.0,76.9 5609 srgba(255,255,255,1)
5195: 281x21+667+90 807.0,99.9 5609 srgba(255,255,255,1)
7959: 281x20+667+137 807.0,146.4 5328 srgba(255,255,255,1)
9341: 281x20+667+160 807.0,169.5 5328 srgba(255,255,255,1)
6540: 281x20+667+114 807.0,123.4 5295 srgba(255,255,255,1)
2375: 281x19+667+46 807.0,55.0 5047 srgba(255,255,255,1)
...
convert image.png -fuzz 5% -trim +repage \
-bordercolor black -border 1 \
-define connected-components:remove=0 \
-define connected-components:mean-color=true \
-connected-components 4 \
-background white -flatten \
-negate \
-define morphology:compose=darken \
-morphology Thinning 'Rectangle:1x80+0+0<' \
-negate \
result.png
Related
Print pixel values where images differ with imagemagick?
Is there an easy way to print the pixel value where two images differ using imagemagick? To be clear, I want to know what the value of that pixel is, as well as its coordinate. It doesn't matter from which image, since I can simply swap them to get the right one.
Let's make two images, both 3px wide and 1px tall:
convert xc:red xc:lime xc:blue +append 1.png
convert 1.png -flop 2.png
If we do the following, we can make any pixels that are identical in the two images become transparent:
convert {1,2}.png -compose changemask -composite mask.png # Note that {1,2}.png is just bash shorthand for "1.png" "2.png"
And if we re-order the input images:
convert {2,1}.png -compose changemask -composite mask.png # Note that {2,1}.png is just bash shorthand for "2.png" "1.png"
So, I assume you want the above, but in text format with the transparent pixels suppressed:
convert {1,2}.png -compose changemask -composite txt: | grep -v ",0)"
Output
# ImageMagick pixel enumeration: 3,1,65535,srgba
0,0: (65535,0,0,65535) #FF0000FF red
2,0: (0,0,65535,65535) #0000FFFF blue
Note that if you want to permit a small difference between the images, you can add some "fuzz-factor". So, if you want rgb(0,100,200) to be considered near enough equal to rgb(3,96,205), you could add -fuzz 5 at the start of the command.
In Imagemagick 6, you can do the following to list the coordinates where the two images differ:
convert image1 image2 -compose difference -composite -threshold 0 txt: | tail -n +2 | grep "white" | awk '{print $1}' | sed 's/://g'
If using Imagemagick 7, change convert to magick
ADDITION:
If you want both the coordinates and the color in one of the two images, then assuming the image has no perfect black pixels, you can do the following:
convert image1 image2 \
\( -clone 0,1 -compose difference -composite -threshold 0 \) \
-delete 1 \
-compose multiply -composite txt: |\
tail -n +2 | grep -v "black" | awk '{print $1,$4}'
For example, I take the lena image and put a blue square in the top left corner to make a second image.
Input:
convert lena.png \( -clone 0 -size 5x5 xc:blue -composite \) \
\( -clone 0,1 -compose difference -composite -threshold 0 \) \
-delete 1 \
-compose multiply -composite txt: |\
tail -n +2 | grep -v "black" | awk '{print $1,$4}'
Results:
0,0: srgb(226,137,124)
1,0: srgb(224,137,130)
2,0: srgb(225,135,121)
3,0: srgb(228,134,121)
4,0: srgb(227,138,125)
0,1: srgb(226,137,124)
1,1: srgb(224,137,131)
2,1: srgb(225,135,121)
3,1: srgb(228,134,121)
4,1: srgb(227,138,126)
0,2: srgb(226,138,124)
1,2: srgb(224,136,127)
2,2: srgb(225,135,120)
3,2: srgb(228,134,121)
4,2: srgb(227,137,121)
0,3: srgb(228,137,122)
1,3: srgb(225,134,114)
2,3: srgb(225,134,118)
3,3: srgb(229,132,112)
4,3: srgb(227,133,113)
0,4: srgb(224,130,109)
1,4: srgb(223,132,110)
2,4: srgb(224,132,116)
3,4: srgb(226,131,112)
4,4: srgb(226,134,117)
If you do have black and the images have no transparency, then you can do:
convert image1 image2 \
\( -clone 0,1 -compose difference -composite -threshold 0 \) \
-delete 1 \
-alpha off -compose copy_opacity -composite \
-background black -alpha background txt: |\
tail -n +2 | grep -v "none" | awk '{print $1,$4}'
For example:
convert lena.png \( -clone 0 -size 5x5 xc:blue -composite \) \
\( -clone 0,1 -compose difference -composite -threshold 0 \) \
-delete 1 \
-alpha off -compose copy_opacity -composite \
-background black -alpha background txt: |\
tail -n +2 | grep -v "none" | awk '{print $1,$4}'
Results:
0,0: srgba(226,137,124,1)
1,0: srgba(224,137,130,1)
2,0: srgba(225,135,121,1)
3,0: srgba(228,134,121,1)
4,0: srgba(227,138,125,1)
0,1: srgba(226,137,124,1)
1,1: srgba(224,137,131,1)
2,1: srgba(225,135,121,1)
3,1: srgba(228,134,121,1)
4,1: srgba(227,138,126,1)
0,2: srgba(226,138,124,1)
1,2: srgba(224,136,127,1)
2,2: srgba(225,135,120,1)
3,2: srgba(228,134,121,1)
4,2: srgba(227,137,121,1)
0,3: srgba(228,137,122,1)
1,3: srgba(225,134,114,1)
2,3: srgba(225,134,118,1)
3,3: srgba(229,132,112,1)
4,3: srgba(227,133,113,1)
0,4: srgba(224,130,109,1)
1,4: srgba(223,132,110,1)
2,4: srgba(224,132,116,1)
3,4: srgba(226,131,112,1)
4,4: srgba(226,134,117,1)
Create CircleText on image with Imagemagick (convert)
I've a round image and I need to put some circle text on it.
The text is from the frontend where the preview is build with CircleType.js (http://circletype.labwire.ca/) a jQuery Plugin.
$("span#text").circleType({
radius: 102,
dir: -1
});
I checked http://www.imagemagick.org/Usage/fonts/ without a solution
currently I get this result
with the following code:
convert \
-background none \
-font Candice \
-pointsize 32 \
-fill navy label:\"A short TEST text\" \
-rotate 180 \
-distort Arc '270 180' \
outfile.png
but it isn't ever the same radius / distance to the border, base on the text length like in the first image.
Can somebody help me, please
Not sure exactly what you want, but you can hopefully see how to get there from this. Like this maybe: convert \ -background yellow \ -pointsize 64 \ -fill navy label:"A longer test text" \ -rotate 180 \ -distort arc '270 180' \ -trim +repage -resize 400x400 -gravity south -extent 400x400! outfile.png
Imagemagick (convert: pixels are not authentic)
I have a command-line that outputs an image as intended but gives me an error on completion of convert: pixels are not authentic. Why could this be happening? I am using ImageMagick 6.9.2-8 Q16 x86_64 2015-12-06 in Term2 on OSX El Capitan. The command / output / error : convert -verbose artwork.jpg -resize 1800x \ \( +clone -gravity center -background white -extent 2000x2000 \) \ \( -clone 1 displaceY.png -compose displace -define compose:args=0x5% -composite \) \ \( -clone 2 -gravity west displaceX.png -compose displace -define compose:args=5x0% -composite \) \ -delete 0--2 \( +clone alpha.png -compose copy_opacity -composite \) -delete 0 out.png artwork.jpg JPEG 2952x2124 2952x2124+0+0 8-bit sRGB 911KB 0.000u 0:00.000 displaceY.png PNG 2000x2000 2000x2000+0+0 8-bit sRGB 109KB 0.000u 0:00.000 displaceX.png PNG 2400x2400 2400x2400+0+0 8-bit sRGB 104KB 0.000u 0:00.000 alpha.png PNG 2000x2000 2000x2000+0+0 8-bit sRGB 63.9KB 0.000u 0:00.000 artwork.jpg=>out.png JPEG 2952x2124=>2000x2000 2000x2000+0+0 8-bit sRGB 572KB 0.000u 0:00.000 convert: pixels are not authentic `artwork.jpg' # error/cache.c/QueueAuthenticPixelCacheNexus/4017.
It's hard to debug without the files and without knowing what you are trying to achieve, but I'll say what I see and maybe that will help. Here is what I think you have in the various layers: 0 - artwork 1800px wide 1 - artwork extended to 2000x2000 2 - clone of (1) 3 - clone of (2) and then we come to the last line... and you delete 0--2 which is suspicious, did you mean 0-2, because 0--2 is actually 0,1. So what did you mean to have in your image list after this -delete 0--2, I mean, how many images? I guess you meant to have 1 left. Then you clone it, why do you do that? You could just copy the opacity right onto it and then you wouldn't need a -delete at the end?
No one can answer why this may have been happening but most could agree there is a better way of doing it, a few of these produce no error. It seems to be related to using clone request after a certain point in the chain. Here are two commands that resolve this issue and provide the correct output image: convert artwork.jpg +repage -thumbnail 1800x -gravity center -background white -extent 2000x2000 \ -gravity northwest displaceY.png +repage -compose over -compose displace -define compose:args=0x5% -composite \ -gravity northwest displaceX.png +repage -compose over -compose displace -define compose:args=5x0% -composite \ -gravity center alpha.png -compose over -compose copy_opacity -composite final.png or convert artwork.jpg +repage -thumbnail 1800x -gravity center -background white -extent 2000x2000 \ -gravity northwest displaceX.png displaceY.png +repage -compose over -compose displace -define compose:args=0x5% -composite \ -gravity center alpha.png -compose over -compose copy_opacity -composite final.png Thanks to Fred over in the ImageMagick forums.
ImageMagick: How to resize proportionally with mogrify without a background
I was following this example http://cubiq.org/create-fixed-size-thumbnails-with-imagemagick, and it's exactly what I want to do with the image, with the exception of having the background leftovers (i.e. the white borders). Is there a way to do this, and possibly crop the white background out? Is there another way to do this? The re-size needs to be proportional, so I don't just want to set a width re-size limit or height limit, but proportionally re-size the image.
The example you link to uses this command: mogrify \ -resize 80x80 \ -background white \ -gravity center \ -extent 80x80 \ -format jpg \ -quality 75 \ -path thumbs \ *.jpg First, mogrify is a bit dangerous. It manipulates your originals inline, and it overwrites the originals. If something goes wrong you have lost your originals, and are stuck with the wrong-gone results. In your case the -path thumbs however alleviates this danger, because makes sure the results will be written to sub directory thumbs Another ImageMagick command, convert, can keep your originals and do the same manipulation as mogrify: convert \ input.jpg \ -resize 80x80 \ -background white \ -gravity center \ -extent 80x80 \ -quality 75 \ thumbs/output.jpg If want the same result, but just not the white canvas extensions (originally added to make the result a square 80x80 image), just leave away the -extent 80x80 parameter (the -background white and gravity center are superfluous too): convert \ input.jpg \ -resize 80x80 \ -quality 75 \ thumbs/output.jpg or mogrify \ -resize 80x80 \ -format jpg \ -quality 75 \ -path thumbs \ *.jpg
I know this is an old thread, but by using the -write flag with the -set flag, one can write to files in the same directory without overwriting the original files: mogrify -resize 80x80 \ -set filename:name "%t_small.%e" \ -write "%[filename:name]" \ *.jpg As noted at http://imagemagick.org/script/escape.php, %t is the filename without extension and %e is the extension. So the output of image.jpg would be a thumbnail image_small.jpg.
This is the command I use each time I want to batch resized everything to 1920x and keep aspect ratio. mogrify -path . -resize 1920x1920 -format "_resized.jpg" -quality 70 *.jpg
Transparent PNGs and a JPEG combine in ImageMagick
I have a case where I need to combine two transparent layers on top of JPEG files. Here a sample setup: wget -O bg.jpg http://www.grahamowengallery.com/photography/Flowers/roadside-flowers.jpg wget -O layer.png http://www2.picturepush.com/photo/a/6271450/640/TRANSPARENT-EMBELLISHMENTS/pink-flower-transparent-png.png wget -O logo.png http://upload.wikimedia.org/wikipedia/commons/0/0d/Imagemagick-logo.png I can get desired result with commands: composite bg.jpg \( -compose Overlay layer.png \) bg2.jpg composite bg2.jpg \( -compose Overlay logo.png \) result.jpg This is good, but I want to avoid writing bg2.png to drive. I tried: composite bg.jpg \( -compose Overlay layer.png \) \( -compose Overlay logo.png \) result2.jpg but this results on layer.png on black background. How can I fix this?
I couldn't make composite working, but convert works: convert.exe bg.jpg layer.png -compose Overlay -composite logo.png -compose Overlay -composite result2.jpg Further reading: http://www.imagemagick.org/Usage/compose/
I can not test this at the moment but you may be able to use layers merge and you should be able to use the URLs in your code.
$cmd = "http://www.grahamowengallery.com/photography/Flowers/roadside-flowers.jpg ".
" http://www2.picturepush.com/photo/a/6271450/640/TRANSPARENT-EMBELLISHMENTS/pink-flower-transparent-png.png ".
" http://upload.wikimedia.org/wikipedia/commons/0/0d/Imagemagick-logo.png -layers merge ";
exec(" convert $cmd result.jpg ");
You are not using any positioning for your layers - are you going to introduce that later? If so you can add -page +0+0 in front of each image to locate them where you want. +0+0 would be changed to the location.