Is there a way that I can use the convert from imagemagick command to create a bleed margin in a PDF or even view one?
Bleed is a very common print technique, and ImageMagick offers the concept of "Virtual Pixels" which are the pixels located on the plane outside of "Authentic Pixels".
For example...
Take the following image
convert rose: rose.png
Set new viewport, and bleed virtual pixel across edge.
convert rose.png -set option:distort:viewport 90x66-10-10 \
-virtual-pixel Edge -filter point \
-distort SRT 0 +repage output.png
I bit more creativity (and maths) to include trim lines.
convert \( \
-size 110x86 xc:white -fill none -strokewidth 1 -stroke black \
-draw "path 'M 20 0 V 85 M 89 0 V 85 M 0 20 H 110 M 0 65 H 110'" \) \
\( output.png -repage +10+10 \) -layers merge \
output_with_trim.png
Related
The ImageMagick documentation provides guidance on how to create torn page effects (https://www.imagemagick.org/Usage/thumbnails/#torn). However, in their implementation, all edges are torn. Suppose I wish to tear off only the bottom or top part of the image. How can I achieve such a thing using ImageMagick?
Simply grow the top & sides by using -extent operator.
convert zelda.png -background pink -extent 148x138-10-10 extent.png
(Adding pink background for visibility on stack)
Apply the effect from the Usage documentation.
convert extent.png \( +clone -alpha extract -virtual-pixel black \
-spread 10 -blur 0x3 -threshold 50% -spread 1 -blur 0x.7 \) \
-alpha off -compose Copy_Opacity -composite torn.png
Then crop back to original image size.
convert torn.png -crop 128x129+10+10 output.png
Update
If you do not want to use geometry, you can use a combination of -border, -shave & -chop.
convert zelda.png -bordercolor pink -border 10x10 -gravity South -chop 0x10 extent.png
convert extent.png \( +clone -alpha extract -virtual-pixel black \
-spread 10 -blur 0x3 -threshold 50% -spread 1 -blur 0x.7 \) \
-alpha off -compose Copy_Opacity -composite torn.png
convert torn.png -shave 10x -chop 0x10 output.png
.. And of course, this all can be done with one command.
convert zelda.png -bordercolor pink -border 10x10 -gravity South -chop 0x10 \
\( +clone -alpha extract -virtual-pixel black -spread 10 -blur 0x3 -threshold 50% \
-spread 1 -blur 0x.7 \) -gravity Forget -alpha off -compose Copy_Opacity -composite \
-shave 10x -chop 0x10 output.png
There are several ways to create a torn edge effect using ImageMagick. Here is another example command using IM version 6 and *nix syntax. This should apply a torn effect to just the top edge of any input image while keeping the original dimensions of the image.
convert input.png -alpha set -background black -fill white \
\( +clone -colorize 100 -gravity south -chop 0x6 -splice 0x6 \
-spread 6 -paint 2 +transparent white -blur 0x0.5 \) \
-background none -compose dstin -composite torn.png
That creates a white mask inside the parentheses. Then a small amount of the "torn" edge is chopped off and a black strip is spliced on to replace it. The random-ish torn edge is created using "-spread" and "-paint" between the white and black areas of the mask. After that, outside the parentheses, that mask is used to apply the transparent torn area to the input image.
To apply the effect to the bottom edge, just change the "-gravity north" to "-gravity south".
To make the torn edge on the left or right, change the gravity setting to "west" or "east", and change the values of the "-chop" and "-splice" operations from "0x6" to "6x0".
This should work the same way using ImageMagick version 7 by changing the "convert" command to "magick".
To use it in Windows, remove the backslashes that escape the parentheses from "\(...\)" to "(...)", and change the continued line backslashes "\" to carets "^".
I'm trying to find a good way to add a 3px white stroke to a ton of png files, effectively to make them look like "stickers." I've got some sample code that does a decent job, but I can't seem to get the cropping right. Also, the stroke looks a bit pixelated and I wanted to know if it's possible to get cleaner edges!
I did a bunch of internet scouring, found some sample code, tweaked it around, and came to something that almost resembles what I'm looking for. The images are always going to be PNGs, so I looked into things like inkscape/gimp from the command line but realized I should be able to do this just using convert from the terminal.
convert in.png \
\( -clone 0 -alpha extract -threshold 0 \) \
\( -clone 1 -blur 10x65000 -threshold 0 \) \
\( -clone 2 -fill red -opaque white \) \
\( -clone 3 -clone 0 -clone 1 -alpha off -compose over -composite \) \
-delete 0,1,3 +swap -alpha off -compose copy_opacity -composite \
out.png
in:
out:
ideally:
Your main problem is it is that you do not have enough space bettween your object and the sides of the image. You just need to add your image with transparency and then remove any excess later.
In ImageMagick 6, this should do what you want.
1) read the input
2) add a larger border than you need to add
3) extract the alpha channel from the input and dilate it by the amount of border (in this case 10)
4) copy the previous image and color the white as red and the black as transparent
5) composite the original over the red/transparent image
6) delete the original and the red/transparent image
7) swap the composite with the dilated alpha channel and put the dilated alpha channel into the alpha channel of the previous image
8) trim the excess transparency from the border padding
9) save to output
convert img.png \
-bordercolor none -border 20 \
\( -clone 0 -alpha extract -morphology dilate diamond:10 \) \
\( -clone 1 -fuzz 30% -fill red -opaque white -fill none -opaque black \) \
\( -clone 2,0 -compose over -composite \) \
-delete 0,2 \
+swap -alpha off -compose copy_opacity -composite \
-trim +repage \
result.png
For ImageMagick 7, replace convert with magick.
If on a Unix-like system, you might be interested in my bash ImageMagick script, contour, at http://www.fmwconcepts.com/imagemagick/index.php
A better result can be achieved by replacing diamond:10 with disk:10
Follow up on “Diff” an image using ImageMagick
When you are working with forms (as opposed to images), the changes are very hard to see with this technique. I wanted to show some type of yellow highlight maybe 10-20 pixels "bigger" (padding) around the actual pixels that changed.
So instead of just this
Something more like this
It seems like I am just missing something here in the stack that can make this work.
convert '(' file1.png -flatten -grayscale Rec709Luminance ')' \
'(' file2.png -flatten -grayscale Rec709Luminance ')' \
... here ? ...
'(' -clone 0-1 -compose darken -composite ')' \
... or here ? ...
-channel RGB -combine diff.png
I can also run this as separate commands and does not need to be fast, most of this is going to be run offline.
I also tried studying the technique here (specifically how the thumbnail scaling gives you the effect I want as the pixels get expanded) but this code is using the library instead of the ImageMagick command line tools. Line 248 => "make the red as visible as possible"
https://github.com/vslavik/diff-pdf/blob/master/diff-pdf.cpp#L218
An example form is the standard W-9. I made 2 subtle changes
PART II .. moved the 2. left about 2 pixels
PART II .. on 4., moved word is to the right 2 pixels
and the compare pumps out this (changes in red that you can barely see)
Thank you for any help
You can use -morphology dilate in Imagemagick to increase the size of the red areas. For example, using your two forms:
convert JW0wZ.png 1nHWT.png -compose difference -composite -morphology dilate disk:10 +level-colors black,red result.gif
UPDATE:
If you want the background transparent, then try
convert JW0wZ.png 1nHWT.png -compose difference -composite -morphology dilate disk:10 +level-colors "black,red" -fuzz 20% -transparent black result.png
Or better
convert JW0wZ.png 1nHWT.png -compose difference -composite -morphology dilate disk:10 -alpha copy -background red -alpha shape result2.png
Update 2: Here is how to overlay a 50% yellow marking onto you two originals. Change the value as desired. I create a difference image and dilate the white. Then I create a 50% yellow image. Then I composite each of the originals with the yellow using the difference image as a mask. See https://www.imagemagick.org/Usage/compose/#compose
convert JW0wZ.png 1nHWT.png \
\( -clone 0,1 -compose difference -composite -morphology dilate disk:10 \) \
\( -clone 0 -fill yellow -colorize 100 -channel a -evaluate set 50% +channel \) \
\( -clone 0,3,2 -compose over -composite +write 1.png \) \
\( -clone 1,3,2 -compose over -composite +write 2.png \) \
null:
To view this, if on Unix and have X11 installed, you can do
animate -delay 20 -resize 50% 1.png 2.png
Not sure how to put this question otherwise - but let's assume I have three square images. I'd like to arrange them in a sort of a square 2x2 grid, such that image 2 is bottom left, image 3 is bottom right - and image 1 is top center (so image 1 is not in the cells of the grid on top; neither left cell, nor right cell, but in center of the row delimited by them).
Closest I could get was with this test, done on Ubuntu 14.04, montage --version ImageMagick 6.7.7-10 2017-07-31 Q16:
montage \
<(convert -size 100x100 xc:green bmp:-) \
<(montage \
<(convert -size 100x100 xc:blue bmp:-) \
<(convert -size 100x100 xc:red bmp:-) \
-geometry +5+5 bmp:- \
) \
-geometry +5+5 -tile 1x2 bmp3:- | display
... or as one-liner:
montage <(convert -size 100x100 xc:green bmp:-) <(montage <(convert -size 100x100 xc:blue bmp:-) <(convert -size 100x100 xc:red bmp:-) -geometry +5+5 bmp:- ) -geometry +5+5 -tile 1x2 bmp3:- | display
The image produced is:
What I want instead is something like this (I edited this manually in an image editor):
... that is, somewhat like that old meme Triforce (Wikipedia)
How could I achieve that with ImageMagick's montage?
This might be a case where ImageMagick's "convert" command would serve you better than "montage". Here is an example that should get you pretty much the same result...
convert -size 100x100 xc:green xc:blue xc:red -bordercolor white -border 5 \
\( -clone 1,2 +append \) -delete 1,2 -gravity center -append -border 5 out.bmp
Using "convert" can give you more freedom to arrange the images using "+append" and "-append" to attach them, "-gravity" for alignment, and "-border" for spacing.
For almost 4 days I searched for a command how I could add a crop-mark to my image.
I have installed ImageMagick software as well. I tried so many commands but am not able to crop with adding proper gutter and a crop mark.
My image should look like this after the conversion:
https://alphagraphicslisle.files.wordpress.com/2011/12/gutter-2.png?w=540
Assuming you would know the dimensions of the crop area, you would use ImageMagick's Draw commands to add trim/crop lines.
If your source image does not have a bleed region, you can generate one with an Edge virtual pixel.
convert rose: -set option:distort:viewport 90x66-10-10 \
-virtual-pixel Edge -filter point -distort SRT 0 \
+repage rose_with_bleed.png
(Note: The rose: input image is a special name, using a built-in demo image that's present in every ImageMagick installation.)
Simplest/fastest way I can think of a solution would be to..
Draw trim-lead lines first
Composite image over lead
Draw crop rectangle over image
Example:
convert -size 110x86 xc:white \
-strokewidth 1 -stroke gray \
-draw 'line 20 0 20 86 line 90 0 90 86' \
-draw 'line 0 20 110 20 line 0 66 110 66' \
rose_with_bleed.png \
-geometry 90x66+10+10 -composite \
-stroke red -fill transparent \
-draw 'rectangle 20 20 90 66' \
out.png