convert
scale up using nearest neighbour interpolation
https://graphicdesign.stackexchange.com/a/41189
convert from.png -interpolate Nearest -filter point -resize 800% to.png
create a side by side image:
https://stackoverflow.com/questions/20737061/merge-images-side-by-side-horizontally
convert +append LEFT.jpg RIGHT.jpg COMBI.png
batch set jpg quality to 80%
mogrify -quality 80% *.jpg
cmyk pdf to rgb jpg sequence
convert -colorspace sRGB input.pdf output/%d.jpg
16bit grayscale to separate 8 bit color channels (with Python)
https://gist.github.com/companje/85e94ea96629ddaf1219f137b225fd69
combine images vertically and create filename with 0's padding
folder="folder/"
for number in `seq 1 1 370`;
do
temp_num="00000$number"
padded="${temp_num:(-5)}"
input1=$number-1.tif
input2=$number.tif
result=NL-UtHUA_0046_00_00727_00J_$padded.jpg
convert "$folder$input1" "$folder$input2" -clone 0 -delete 0 -gravity North -append $result
done
unsharp (mask?)
convert INPUT.jpg -unsharp 10x4+1+0 OUTPUT.jpg
blacken
convert INPUT.jpg -fill "black" -draw "rectangle 0,440,3000,4200" -draw "rectangle 0,0,3000,180" -draw "rectangle 1870,0,3000,440" ../black/NL-OUTPUT.jpg
crop
convert test.jpg -crop 1870x290+0+150 x.jpg
separate channels to different (grayscale) files
convert rgb.png -separate %d.png
convert 16 bit grayscale to 2x 8 bits channel/file
convert 16_bit_unsigned_int.tif -endian MSB -depth 8 8_bit_hi.png
convert 16_bit_unsigned_int.tif -endian LSB -depth 8 8_bit_lo.png
resize (and replace) to longest axis 2048
mogrify -resize 2048 *.jpg
resize to certain filesize
will take 4 to 8 times longer
convert INPUT -define jpeg:extent=2MB OUTPUT
Convert to thumbs
mogrify -resize x400 *.jpg # all jpg's in folder are resized to height 400px (overwriting originals)
Convert 16 bit grayscale png to 16 bits raw
stream -map r -storage-type short earth-elevation.png earth-elevation.raw
or
convert input.png output.gray
Convert 16 bit grayscale png to 2 separate 8 bits png's
there must be a better way...
convert input16bits.png 16.gray
convert -size 4096x2048 -endian MSB 16bits.gray -depth 8 8bits-hi.png
convert -size 4096x2048 -endian LSB 16bits.gray -depth 8 8bits-lo.png
contrast-stretch / normalize
convert earth-elevation.png -depth 16 -normalize earth.png
convert pdf to png high quality
convert \
-verbose \
-density 150 \
-trim \
test.pdf \
-quality 100 \
-flatten \
-sharpen 0x1.0 \
24-18.jpg
convert from 16bit to red+green channel
(somehow this doesn't work for me anymore)
convert Mars_8k_16bit.tif -depth 24 mars24.rgb
convert -size 8192x4096 -depth 8 rgb:mars24.rgb mars_redgreen.png
convert DDS to PNG
convert Mars-normalmap_8k.dds Mars-normalmap_8k.png
1 resize (sample) very large image file
convert -debug cache -limit area 1GB /Users/rick/Downloads/Mars_MGS_MOLA_DEM_mosaic_global_463m.tif -sample 4096x2048 test.tiff
2 create redgreen gradient palette 64k wide
convert -size 10x65535 -rotate -90 gradient:red-green redgreen.png
# black-yellow
convert -size 1x65535 -rotate -90 gradient:black-yellow blackyellow.png
3 lookup colors in palette (not sure yet if it solves my problem)
convert -interpolate bilinear /Users/rick/Downloads/mars-8k-16bpp-bump.tiff redgreen.png -clut -depth 8 out.png
works:
convert -size 1x65535 -rotate -90 gradient:black-yellow blackyellow.png
convert -interpolate bilinear Mars_8k_Disp_v001.tif blackyellow.png -clut -depth 8 out.png
Convert multiple jpg's into bmp's
for i in *.jpg; do sips -s format bmp $i --out ../clouds-201509-bmp/$i.bmp;done
Resize batch
first height, then width!
for i in *.jpg; do sips -z 1024 2048 $i --out ../clouds-201509-2k/$i;done
create gradient
convert -size 100x300 gradient:#000-#f00 gradient:#f00-#ff0 gradient:#ff0-#fff gradient:#fff-#0ff gradient:#0ff-#00f gradient:#00f-#000 -append lut.png