Revision of ImageMagick_tricks.md

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ImageMagick_tricks.md

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ImageMagick_tricks.md

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ImageMagick_tricks.md

mag37 revised this gist 1 month ago · b4ae0f8

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ImageMagick_tricks.md (file created)

			@@ -39,10 +39,12 @@ magick input.png -resize 1920x1080^ -gravity center -extent 1920x1080 output.png
39	39		Some examples, could use with any of the above.
40	40
41	41		```sh
42		-	# Resize all jpgs to 60% of their original size
	42	+	# Resize all jpgs to 60% of their original size, adding `60_` prefix to output name
43	43		for i in *.jpg; do magick $i -resize 60% "60_$i"; done
44	44
45		-	# Resize a directory full of wallpapers to overflow and crop, `-backgroun none` to preserve transparency
	45	+	# Resize a directory full of wallpapers to overflow and crop
	46	+	# `-backgroun none` to preserve transparency
	47	+	# renaming with a suffix eg. input.png -> input_1920x1080.png
46	48		for i in *.png; do magick "$i" -background none -resize 1920x1080^ -gravity center -extent 1920x1080 "${i%.png}_1920x1080.png"; done
47	49		```
48	50

			@@ -1,4 +1,4 @@
1		-	## Basic resizing with different end
	1	+	## Basic resizing with different results
2	2		```sh
3	3		# Resize to fit within 800x600, preserving aspect ratio
4	4		magick input.png -resize 800x600 output.png

			@@ -1,6 +1,48 @@
	1	+	## Basic resizing with different end
	2	+	```sh
	3	+	# Resize to fit within 800x600, preserving aspect ratio
	4	+	magick input.png -resize 800x600 output.png
	5	+	# 1000x1000 -> 600x600, 1600x1000 -> 800x500
	6	+
	7	+	# Resize by percentage, rounds to closest integer pixel which can be off compared to exact pixels
	8	+	magick input.png -resize 50% output.png
	9	+	# 1000x800 -> 500x400, 800x593 -> 400x297 (half a pixel too high, could distort)
	10	+
	11	+	# Resize to fit 800 height, width will scale to match - move the x to swap
	12	+	magick input.png -resize x800 output.png
	13	+	# 200x400 -> 400x800, 1600x1600 -> 800x800
	14	+
	15	+	# Force exact dimensions, breaking aspect ratio scaling. Escape like this `\!`
	16	+	magick input.png -resize 1100x800\! output.png
	17	+	# 1600x900 -> 1100x800
	18	+
	19	+	# Only shrink larger images, never enlarge smaller. Escape like this `\>`
	20	+	magick input.png -resize x800\> output.png
	21	+	# # 200x400 -> 200x400, 1600x1600 -> 800x800
	22	+
	23	+	# Resize based on smallest fitting dimension, Image will fill and overflow. Useful together with -crop/-extent
	24	+	magick input.png -resize 800x800^ output.png
	25	+	# 200x400 -> 800x1600, 1000x2000 -> 800x1600
	26	+
	27	+	# Resize to fit within size but keep aspect ratio and fill/pad with black
	28	+	magick input.png -background black -resize 400x400 -gravity center -extent 400x400 output.png
	29	+	# 800x400 -> 400x400
	30	+	# original image will first scale to 400x200 then pad with black top+bottom calculated from center
	31	+
	32	+	# The above example to keep aspect ratio but remove overflow, fill and crop
	33	+	magick input.png -resize 1920x1080^ -gravity center -extent 1920x1080 output.png
	34	+	# 1920x1200 -> 1920x1080, 1600x1400 -> 1920x1080
	35	+
	36	+	```
	37	+
1	38		## Batch resize images
2		-	Resize images with ImageMagick, all images in current directory to "resized" subdirectory.
	39	+	Some examples, could use with any of the above.
3	40
4	41		```sh
5		-	for i in *.jpg; do magick $i -resize 60% ./sized/$i; done
6		-	```
	42	+	# Resize all jpgs to 60% of their original size
	43	+	for i in *.jpg; do magick $i -resize 60% "60_$i"; done
	44	+
	45	+	# Resize a directory full of wallpapers to overflow and crop, `-backgroun none` to preserve transparency
	46	+	for i in *.png; do magick "$i" -background none -resize 1920x1080^ -gravity center -extent 1920x1080 "${i%.png}_1920x1080.png"; done
	47	+	```
	48	+

		@@ -0,0 +1,6 @@
1	+	## Batch resize images
2	+	Resize images with ImageMagick, all images in current directory to "resized" subdirectory.
3	+
4	+	```sh
5	+	for i in *.jpg; do magick $i -resize 60% ./sized/$i; done
6	+	```