After I rotate or deskew an image with Imagemagick there's a white background in the corners, where the rotation took place. Example:
convert image.png -rotate 10 out.png
Output: http://imgur.com/8bZQ6
Is there a way I could somehow fill up those white corners with some texture or at least a color that blends in with the image? Cropping is not an option.
I've found this great solution for simple rotation:
convert image.png -virtual-pixel Edge +distort SRT 10 out.png
Output: http://imgur.com/edMS0
But unfortunately it doesn't work with the -deskew command...
So, does anyone know how to fill up those corners in a similar way for the -deskew (and -rotate) command? The point is to mask the fact the image was rotated as best as possible.
I'll go ahead and answer my own question, but I'm still hoping for a better solution.
You can set the -background color, which works with rotate and deskew.
Here's a solution that uses the average image color:
convert image.png -background `convert image.png -resize 1x1 txt:- | tail -1 | cut -b 30-50` -rotate 10 out.png
Output: http://imgur.com/YCqkC
And a better solution that takes some border pixels:
convert image.png -background `convert image.png -resize 100x1! \( +clone -crop 1x1+0+0 \) +append -crop 2x1+99+0 -resize 1x1 txt:- | tail -1 | cut -b 30-50` -rotate 10 out.png
Output: http://imgur.com/4wDPO
There's some bash scripting (inside the backticks), so these solutions are unix only.
Try this:
convert image.png -background transparent -rotate 10 out.png
Related
So there are many questions similar to this, but none that I can find that answers this exact scenario:
After batch trimming a folder of images, how to then make the canvas square, whilst retaining the longest edge? I don't want to use -extent and make them all a fixed width.
Examples of desired output:
800x1200 becomes 1200x1200
1000x600 becomes 1000x1000
1625x1600 becomes 1625x1625 etc....
So for example, if -squared was a function, it would be something like:
mogrify -path squared/ -trim -background white -gravity center quality 75 -squared *.jpg
How to achieve this?
If on ImageMagick 7, you can do the following with -extent to get the max of w and h.
Input:
magick barn.jpg -background black -gravity center -extent "%[fx:max(w,h)]x%[fx:max(w,h)]" x.png
In ImageMagick 6, you can do something similar by using the viewport computations with -distort SRT, but you have to add the offset computations, since -gravity does not work with -distort SRT.
convert barn.jpg -set option:distort:viewport "%[fx:max(w,h)]x%[fx:max(w,h)]+%[fx:(w-max(w,h))/2]+%[fx:(h-max(w,h))/2]" -virtual-pixel black -filter point -distort SRT 0 +repage y.png
I have some png images that I want to split it into parts, like by grid or size.
But each part should have the same bounding box (transparency) as original image.
Example:
Splitting image into 2 parts.
Original: 200 × 89
Output:
part_1.png, 200 × 89
part_2.png, 200 × 89
Can ImageMagick do this? Or any other app or method.
My actual goal is to split into 100+ slices images.
EDIT:
Another goal to have an indents for each slice. Say indent = 10px.
Example:
Input: 200 x 100
Output:
part_1.png, 200 x 100
part_2.png, 200 x 100
And just as example, to visually compare input and output: combined output images in Photoshop as layer added one onto another
200 x 100 :
Also this is showing input image added onto combined(so it's better to see what was cropped and how):
In ImageMagick, you can split an image into many parts with the -crop command. For your example above with two parts, you can do that with the following commands. ImageMagick will append -0, -1 ... to the output file names.
ImageMagick 6:
dim=`convert image.png -format "%wx%h" info:`
convert \( -size $dim xc:none \) null: \( image.png -crop 50x100% \) -layers composite result.png
ImageMagick 7:
magick \( image.png -set option:dim "%wx%h" -crop 50x100% \) null: \( -size "%[dim]" xc:none \) -reverse -layers composite result.png
The results are:
See
http://www.imagemagick.org/Usage/crop/#crop
http://www.imagemagick.org/Usage/crop/#crop_percent
http://www.imagemagick.org/Usage/crop/#crop_tile
http://www.imagemagick.org/Usage/crop/#crop_quad
http://www.imagemagick.org/Usage/crop/#crop_equal
http://www.imagemagick.org/script/command-line-options.php#layers
Note that -crop keeps the virtual canvas information if you do not add +repage afterwards. So to put the individual images back into their original placement, you have to composite them onto a transparent background the size of the input. That is done in one command using -layers composite using the null: separator.
Here is another way to add transparent areas between parts of a crop in ImageMagick. Crop the image into pieces, chop off the parts you want to remove, then pipe to montage to add the spacing back.
Input:
Here I make this into a 4x4 grid of images with 10 pixel spacing:
convert lena.png -crop 25%x25% +repage -gravity east -chop 10x0 -gravity south -chop 0x10 +repage miff:- | montage - -background none -tile 4x4 -geometry +5+5 result.png
To answer your new question, you can do that with a script loop. On a Unix-like platform, assuming your images do not have spaces, you can do the following:
cd path/to/current_folder
list=`ls *.png`
for img in $list; do
name=`convert $img -format "%t" info:`
dim=`convert $img -format "%wx%h" info:`
convert \( -size $dim xc:none \) null: \( $img -crop 50x100% \) -layers composite -scene 1 path/to/new_folder/${name}_%d.png
done
If you want leading 0s in the output, say 3, use path/to/new_folder/${name}_%03d.png.
Note that to start with 1 rather than 0, I have added -scene 1.
Sorry, I do not know how to script for Windows.
Please always provide your ImageMagick version and platform.
In ImageMagick, the best way to put transparent areas into your image is with a binary mask that is put into the alpha channel of your image.
convert input.png \( -size 200x89 xc:white -size 10x89 xc:black -gravity center -composite \) -alpha off -compose copy_opacity -composite result.png
You can add as many blank areas as you want by adding more white areas to the mask or by tiling out one region of black and one region of white to create the mask with regular spacing of black and white.
Edited to add this ImageMagick 6 example which splits the input image into 4 pieces, 25% of the original width and 100% of its height, then creates a transparent canvas for each piece the same dimensions of the input image, and locates the pieces at their original offsets on those canvases.
convert input.png -set option:distort:viewport %[w]x%[h] -crop 25x100% \
-virtual-pixel none -distort affine "0,0 %[fx:s.page.x],%[fx:s.page.y]" out%03d.png
The output file names will be numbered starting from zero like "out000.png", etc.
Original message...
Here's a simple command using ImageMagick 7 that can crop an image into any number of pieces, and output all the pieces at their original offsets on transparent backgrounds of the original input dimensions...
magick input.png -crop 100x1# -background none \
-extent "%[fx:s.page.width]x%[fx:s.page.height]-%[fx:s.page.x]-%[fx:s.page.y]" out%03d.png
That "-crop 100x1#" tells it to split the image into a grid 100 pieces wide by 1 piece high. You could just as well specify the crop sizes as percents or numbers of pixels.
Edited again to add:
This following command will split the input image into the individual pieces specified with the "-crop" operator, then shave 5 pixels from every side of each piece, then apply a 5 pixel transparent border to every side of each piece. It will still remember the original locations of the pieces within the input canvas, so the "-distort affine ..." can extend the canvases and place the pieces where they were in the input image.
convert input.png -set option:distort:viewport %[w]x%[h] \
-bordercolor none -background none -virtual-pixel none \
-crop 25x100% -shave 5x5 -border 5x5 \
-distort affine "0,0 %[fx:s.page.x],%[fx:s.page.y]" out%03d.png
To use this command with IM7 you need to change "convert" to "magick".
Given the changes of requirements provided by Kamikaze, here is one way to achieve the split with indent in ImageMagick, assuming I understand correctly.
dim=`convert image.png -format "%wx%h" info:`
convert \( -size $dim xc:none \) null: \( image.png -crop 50x100% -shave 5x5 \) -geometry +5+5 -layers composite result.png
To check, I flatten over a blue background:
convert result-0.png result-1.png -background blue -flatten result.png
I have images where I would like to make the background transparent, remove the shadow and remove the product reflection.
So what I want to do is
Remove reflection
Remove shadow
Remove background
Test image
In Imagemagick 6, you can threshold the image and get the bounds of the black area. Then crop the original to those bounds.
convert image.png -threshold 50% +write image_thresh50.png -format "%#" info:
229x367+39+0
convert image.png -crop 229x367+39+0 +repage image_cropped.png
If using Imagemagick 7, change convert to magick.
Is this what you want?
To follow up on Bonzo's comment, in Unix ImageMagick 6, I could do:
cropvals=$(convert image.png -threshold 50% +write hAfUS_thresh50.png -format "%#" info:)
convert image.png -crop $cropvals +repage image_cropped.png
And in Unix, Imagemagick 7, I could do:
magick image.png \( +clone -threshold 50% -set option:cropvals "%#" +delete \) -crop "%[cropvals]" +repage image_cropped2.png
The reason I did not post these was because I did not know what OS/Platform the OP was using. It always helps when asking questions about Imagemagick to post its version and the platform it is run on.
Sorry I do not know how to do this in Windows syntax
How can I blend AND translate at the same time ?
Something like this : http://www.imagemagick.org/Usage/layers/#flatten but in such a way that the images are transparent.
I was trying :
composite -blend 90 -page +0+0 input01.jpg -page +500+0 input02.jpg -resize x400 outputSimpleMosaicBlend01.
but this did not work.
So if I have two input images:
Then how can I get an image that looks like the composite image below ?
Any suggestions how to do this programatically (not manually) with ImageMagick ? Or some other tools ?
I would like to create several thousands of composite images like that (for an animation) and I would like to automate the process.
The problem is that I can find examples that overlay images and that translate images but I cannot find examples that do these two operations simultaneously.
This is the main goal of this question, to give such code/script examples, how to do that with image manipulation tools like ImageMagick programmatically.
EDIT:
Things that I tried and did not work:
convert a.jpg -geometry +100+0 b.jpg -compose blend -composite result.jpg
gives:
I tried
convert -background none a.jpg -geometry +100+0 b.jpg -compose blend -composite result.jpg
too which gives the same result.
I got this :
with this
convert -background none input01.jpg input02.jpg -geometry +1200+0 -compose blend -define compose:args=50 -composite result.jpg
command.
It's getting close ! Thanks Mark!
A slightly different way of doing this is to set the width of the output image using -extent and then to overlay the right hand image using -gravity East to align it to the right edge - seems a fraction more intuitive to me - but go with whatever works for you!
convert a.jpg -background white -extent 2800x \
\( b.jpg -resize 150% -alpha on -channel A -evaluate set 50% +channel \) \
-gravity east -composite result.jpg
Thanks to Snigbo, the following command :
convert input02.jpg \( input01.jpg -resize 150% -alpha Opaque -channel A -evaluate Multiply 0.5 +channel -set page +1200+30 \) -background White -layers merge a.jpg
produces:
The rotate option in ImageMagick's convert tool rotates the image but adds background color to fill the gaps.
I'm looking for a way to rotate and then crop the largest rectangle containing content of the image. Is it possible with convert?
Edited by Mark Setchell...
So, if your original rectangle is a checkerboard created like this:
convert -size 512x512 pattern:checkerboard a.png
and you rotate it through 20 degrees like this
convert -background fuchsia -rotate 20 a.png b.png
you want the largest rectangle that fits on the checkerboard and contains no pink?
You can get an approximation of your expected result by using +repage and replacing -rotate with -distort ScaleRotateTranslate:
convert -background fuchsia -distort ScaleRotateTranslate 20 +repage a.png b.png
After creating the image as indicated:
convert -size 512x512 pattern:checkerboard a.png
This seems to do the work:
angle=20
ratio=`convert a.png -format \
"%[fx:aa=$angle*pi/180; min(w,h)/(w*abs(cos(aa))+h*abs(sin(aa)))]" \
info:`
crop="%[fx:floor(w*$ratio)]x%[fx:floor(h*$ratio)]"
crop="$crop+%[fx:ceil((w-w*$ratio)/2)]+%[fx:ceil((h-h*$ratio)/2)]"
convert a.png -set option:distort:viewport "$crop" \
+distort SRT $angle +repage rotate_internal.png
From here.