I'm after a very specific conversion result from Imagemagick, taking something like this:
And converting it into something like this (1140 pixels wide, 12px border around the top, left, and right of the original):
So far I'm using this code to convert it:
convert nike.jpg -colorspace RGB -density 72 -gravity west -background white -extent 1140x104 nike2.jpg
But I'm getting this very skewed result:
Any advice on how to get closer to my goal here? I guess I'm trying to chain Imagemagick commands here to reduce the size to 78px high, add a 12px border, then extend the background on the right to 1140px wide, and I'm not really sure how to chain commands in Imagemagick via Paperclip.
Solved perfectly:
convert nike.jpg -colorspace RGB -density 72 -resize 78 -gravity west -bordercolor white -border 12x12 -background white -extent 1140x104 nike3.jpg
Related
Friends,
I need to -trim some images but keep the original canvas size. Works like this:
convert in.png -fuzz 10% -trim -background white -set page "%[fx:w]x%[fx:h]" +repage out.png
But how can I position the trimmed image part at it's original position? -gravitiy center is not an option as the to-be-trimmed part usually not at the canvas center.
Any ideas?
You should be able to -trim an image, then use -flatten to lay it back onto its original canvas. Try this command...
convert logo: -background none -trim -flatten trimmed.png
#GeeMack's answer is certainly simpler and more succinct, but if you need more flexibility for dinking around, another way is to get the image height and width and the trimbox in one invocation and use them in the next - maybe with adaptation.
So, starting with this image:
# Get image width and height and the trim-box
read geom trim < <(magick start.png -format "%G %#" info:)
# Make a new white canvas same size as original and trim new image onto it
magick -size $geom xc:white \( start.png -crop $trim \) -flatten result.png
I put an artificial yellow border around it so you can see the extent of it on SO's white background.
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
Using imagemagick, I want to clean the left side of an image, i.e. make white without cropping. For example cleaning the left-most vertical strip of 25 pixels wide. I figured out how to crop to a given geometry, but I couldn't figure out how to clean without cropping.
Here is my start image, made like this:
convert -size 256x256 gradient:cyan-yellow image.png
Method 1
One way to do it would be to use -fx and set all pixels where the x-coordinate is less than 25 to 1.0 (i.e. white) and leave all other pixels as they are:
convert image.png -fx "i<25?1:u" result.png
Method 2
Another, faster way to do it might be to clone the original image, and scale it down to 25 pixels wide, fill it with white and composite that over the original image:
convert image.png \
\( +clone -scale 25x! -fill white -colorize 100 \) \
-composite result.png
The result is the same.
Method 3
A third way to do it might be to crop the image 25 pixels in from the left side, then splice 25 white pixels back on the left side:
convert image.png -crop +25+0 -background white -gravity west -splice 25x result.png
Method 4
Bit of a kludge, but nearer to what you asked. Here, I guess that your image height doesn't exceed 10,000 pixels and draw a rectangle:
convert image.png -fill white -draw "rectangle 0,0 24,9999" result.png
I guess the proper way to do this is to get the height first then use it:
#!/bin/bash
h=$(convert image.png -format "%[fx:h-1]" info:)
convert image.png -fill white -draw "rectangle 0,0 24,$h" result.png
I'm trying to generate an image using Imagemagick to match a preview in the browser, but the text comes out blurry. Does anybody have any suggestions? Attached is an image with the Imagemagick one on top, and browser one on bottom, along with the IM code.
convert -density 288 -resize 25% -background white -fill black -strokewidth 0 -stroke white -font Rubik-Regular.ttf -pointsize 10 -gravity center label:'This is a TEST!' label_arial.gif
You might find it easier to start with caption which automatically sizes the text the best way to fill a given area. So, as your lettering is around 140x36 pixels, you would do:
convert -size 140x36 -gravity center caption:'This is a TEST!' label.gif
Getting started with ImageMagic and trying to find a way to do this... If an image is less than 50 pixels tall or 50 pixels wide, I'd like to place it (un-scaled) in the horizontal/vertical center of a new 50x50 pixel canvas on top of a white background - and save that as the new image. Anyone know if this is possible with ImageMagick? Thanks!
I used -extent to do this:
convert input.jpg -gravity center -background white -extent 50x50 output.jpg
I wanted to do the same, except shrink the image to 70% inside. I used this:
convert input.png -resize 70%x70% -gravity center -background transparent -extent 72x72 output.png
Not exactly what was requested but hopefully it will help someone ;).
I have once used this code to place an image in the center of a new canvas with white background. hope this will help you
convert -background white -gravity center your_image.jpg -extent 50x50 new_image.jpg
See cutting and bordering for a huge number of examples. Here's one simple way you might do it:
convert input.png -bordercolor Black -border 5x5 output.png
Of course, you'll need to calculate the size of the border to add (if any) based on the dimensions of the input image. Are you using an ImageMagick API, or just the command line tools?
I tried this:
convert test.jpg -resize 100x100 -background black -gravity center -extent 100x100 output.png
You can use single composition to do this. So it would look something like this:
convert -size 50x50 xc:white null: ( my_image.png -coalesce ) -gravity Center -layers Composite -layers Optimize output.png
To modify the source image you need to use mogrify:
mogrify -gravity center -background white -extent 50x50 source.jpg
If an image is less than 50 pixels tall or 50 pixels wide
In my case, the images were much larger than the destination canvas, and weren't square. So I resize them proportionally to fit inside. Example:
convert in.png -resize 46x46 -background none -gravity center -extent 50x50 out.png
The 46x46 limit ensures a 2 pixel margin minimum. Note that the above does not distort the image, e.g. a rectangle does not become a square.
I used background none for a transparent background, but you can choose a solid color instead.