(GIFs read from the standard input are written to the standard b Modify each GIF input in place by reading and writing to the sameįilename. m Combine all GIF inputs into one file with multiple frames and write thatįile to the standard output. There can be at most one, and it must precede any GIF inputs. Mode options tell gifsicle what kind of output to generate. ‘ -no-option’, which turns off the option. You can combine short options if they don't take arguments:īut be careful with options that do take arguments: Some options also have a short form, ‘ -X’.
Whole long descriptive name, just enough to make it unambiguous. Gifsicle exits with status 0 if there were no errors and No GIF input file is given, or you give the special filename Gifsicle reads and processes GIF input files in order. Kind of option, start with a number sign (#).
#GIFSICLE COMMAND LOOPCOUNT DOS PLUS#
Most options start with a dash (-) or plus (+) frame selections, a Gifsicle's command line consists of GIF input files and Transformations cropping -crop, -crop-transparency flipping -flip-* resizing -resize, -scale rotating -rotate-* Grayscale -use-colormap Interlacing -interlace Positioningįrames -position Screen, logical -logical-screen Selectingįrames frame selections (like '#0') Transparency -transparent Warnings -no-warnings COMMAND LINE
transform-colormap reducing number -colors, -dither, -gamma Comments -comment Extensions -extension, -app-extension, -extension-info File size -optimize, -unoptimize, -colors, disposal -disposal looping -loopcount portions of frame selections smaller -optimize, -colors, -lossy speed -delay Bad output -careful BackgroundĬhanging -change-color, -use-colormap, -dither, CONCEPT INDEXĬoncepts are on the left, relevant gifsicle options are onĬhanging frame selections, frame changes, etc. If you want to both resize and crop the image, the crop is done first.Īs an example… gifsicle -crop 105,0+270x270 -resize 100x100 resize-gif.gif > resize-gif-cropped-resized.New users may want to skip to the Examples section at the end. For me, this means I put it first in the command so I don’t forget the order. It’s important to note that according to the documentation, “Cropping takes place before any rotation, flipping, resizing, or positioning.” That means if you want to do anything else (like resize, flip, etc.), realize that cropping takes place first. Leaving us with the following: gifsicle -crop 105,0+270x270 resize-gif.gif > resize-gif-cropped.gif We can apply that to our command line input above, adding a 105px offset in the x1 parameter of the crop option. You can find that with this simple formula: ((total longest side) - (total desired length)) / 2 To keep that crop in the center, then, I’ll need 105px offset. The greater than sign tells it to take the original file (i.e., “resize-gif.gif”) and save the cropped version as “resize-gif-cropped.gif” in the same directory.Īlmost right…but it’s offset to the top right-hand corner, so we’re not getting the middle of the gif cropped to a 1:1 square. gifsicle -crop 0,0+270x270 resize-gif.gif > resize-gif-cropped.gif
Next, we provide the cropped dimension: 270x270 as our width and height respectively. For now, let’s just work on getting it to crop the image. 0,0 will start the crop from the top right-hand corner (i.e., x1 = 0 and y1 = 0). The first two tell it where to start the crop from. The crop option takes four parameters: x1, y1 + width x height. Numbers 1, 3, and 4 are self-explanatorry, so let’s focus on #2.
#GIFSICLE COMMAND LOOPCOUNT DOS INSTALL#
On a Mac, you can install gifsicle using Home-brew with the following command: brew install gifsicle 2. Here’s a simple step-by-step guide to using it. I recently needed to crop a gif to a square and found this command-line tool for working with gifs called gifsicle.
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