gifsicle 命令

常用示例

说明

gifsicle is a command-line tool for creating, editing, and optimizing GIF images and animations. It can manipulate existing GIFs, combine multiple images into animations, extract frames, and significantly reduce file sizes. The optimization feature is particularly valuable: level 3 optimization can reduce GIF file sizes by 30-50% without quality loss by storing only changed pixels between frames. Frame selection uses '#' notation (e.g., '#0' for the first frame, '#0-5' for a range).

参数

-o, --output _file_

Write output to file.

--optimize, -O _level_

Optimize GIF (1=store only changed, 2=shrink, 3=max).

--resize _WxH_

Resize to specified dimensions.

--resize-width _W_

Resize to width, maintaining aspect ratio.

--resize-height _H_

Resize to height, maintaining aspect ratio.

--scale _factor_

Scale by factor (e.g., 0.5 for half size).

--delay _time_

Set frame delay in hundredths of a second.

--loopcount _n_

Set loop count (0 or forever for infinite).

--colors _n_

Reduce to n colors (2-256).

--color-method _method_

Color reduction method: diversity, blend-diversity, median-cut.

--crop _x,y+WxH_

Crop to specified region.

--rotate-90, --rotate-180, --rotate-270

Rotate image.

--flip-horizontal, --flip-vertical

Flip image.

--unoptimize, -U

Unoptimize (expand each frame to full image).

--explode

Write each frame to separate file.

--info, -I

Show information about the GIF.

--batch, -b

Modify files in place.