[ubuntu] convert picture size

Ubuntu tool

convert picture size is useful.

Example:
1.convert XXX.jpg -resize 10% XXX.jpg
2.convert XXX.jpg -resize 640x480 XXX.jpg
3. convert example.png -resize 200×100! example.png
4. convert example.png -resize 200 example.png
5. for file in *.jpg; do file2=${file%.jpg};convert -verbose -resize 786432@  $file2.jpg happy/$file2.jpg; done;  （Fixed pixel = 786432@）

Change JPG to jpg
for file in *.JPG; do file2=${file%.JPG}; mv $file2.JPG $file2.jpg; done;

 jpg to jpg

for file in *.jpg; do file2=${file%.jpg};convert -verbose -resize 786432@  $file2.jpg happy/$file2.jpg; done;

 JPG to JPG

for file in *.JPG; do file2=${file%.JPG};convert -verbose -resize 786432@  $file2.JPG happy/$file2.JPG; done;

 JPG to jpg

for file in *.JPG; do file2=${file%.JPG};convert -verbose -resize 786432@  $file2.jpg happy/$file2.jpg; done;

PNG to PNG

 for file in *.png; do file2=${file%.png};convert -verbose -resize 786432@  $file2.png happy/$file2.png; done;

PNG to JPG

 for file in *.png; do file2=${file%.png};convert -verbose -resize 786432@  $file2.png happy/$file2.jpg; done;

NEF to JPG

for file in *.NEF; do file2=${file%.NEF};convert -verbose $file2.NEF happy/$file2.jpg; done;

PNG to EPS

for file in *.png; do file2=${file%.png};convert -verbose -resize 70% $file2.png $file2.eps; done;

Reference :

• ImageMagick Convert Command-line Tool
• How to Quickly Resize, Convert & Modify Images from the Linux Terminal
• linux下使用convert命令修改图片分辨率