![]() Under GPL v3 or later with an additional copyright notice that must be kept for the older parts of the code. See man page ( man pngquant) for the full list of options. Metadata is always removed on Mac (when using Cocoa reader). 16-bit displays or compressed textures in ARGB444 format). Use when the image will be displayed on low-depth screens (e.g. Reduce precision of the palette by number of bits. floyd=0.5Ĭontrols level of dithering (0 = none, 1 = full). Higher speeds are fine with 256 colors, but don't handle lower number of colors well. It's recommended to keep the default, unless you need to generate images in real time (e.g. Speed/quality trade-off from 1 (slowest, highest quality, smallest files) to 11 (fastest, less consistent quality, light comperssion). ![]() skip-if-largerĭon't write converted files if the conversion isn't worth it. When this option is used only single input file is allowed. If you use -ext=.png -force options pngquant will overwrite input files in place (use with caution). Set custom extension (suffix) for output filename. If conversion results in quality below the min quality the image won't be saved (if outputting to stdin, 24-bit original will be output) and pngquant will exit with status code 99. pngquant will use the least amount of colors required to meet or exceed the max quality. Min and max are numbers in range 0 (worst) to 100 (perfect), similar to JPEG. multicore support (via OpenMP) and Intel SSE optimizations.C99 with no workarounds for legacy systems or compilers ( apart from Visual Studio).based on a portable libimagequant library.automatically finds required number of colors and can skip images which can't be converted with the desired quality.unique dithering algorithm that does not add unnecessary noise to the image.advanced quantization algorithm with support for gamma correction and premultiplied alpha.To further reduce file size, try optipng, ImageOptim, or zopflipng. Unix-style stdin/stdout chaining: … | pngquant - | ….batch conversion of multiple files: pngquant *.png.The compression engine is also available as an embeddable library. This is the official pngquant repository. Compressed images are fully standards-compliant and are supported by all web browsers and operating systems. You can choose to retain the original last modified date on the resized image or reset it at time of the resizing action.Pngquant is a PNG compressor that significantly reduces file sizes by converting images to a more efficient 8-bit PNG format with alpha channel (often 60-80% smaller than 24/32-bit PNG files). Example: a value of %2\%1 would save the resized image(s) to Small\example.jpgĬharacters that are illegal in file names will be replaced by an underscore _. You can specify a directory in the filename format to group resized images into sub-directories. Setting the format to %1_%4 on the file example.jpg and selecting the size setting Medium 1366 x 768px would result in the file name: example_768.jpg. Size name (as configured in the PowerToys Image Resizer settings)Įxample: setting the filename format to: %1 (%2) on the file example.png and selecting the Small file size setting, would result in the file name example (Small).png. The file name of the resized image can be modified with the following parameters: Parameter This is not a file type conversion tool, but only works as a fallback for unsupported file formats. ![]() Image Resizer enables you to specify what format the fallback encoder will use: PNG, JPEG, TIFF, BMP, GIF, or WMPhoto settings. In this case, the image cannot be saved in its original format. For example, the Windows Meta File (.wmf) image format has a decoder to read the image, but no encoder to write a new image. The fallback encoder is used when the file cannot be saved in its original format. ![]() The dimension will be calculated to a value proportional to the original image aspect ratio. Stretches the image disproportionally as needed. ![]() Stretch: Fills the entire specified size with the image.Fit: Fits the entire image into the specified size.Fill: Fills the entire specified size with the image.The dimension to be used for resizing can be configured as Centimeters, Inches, Percent and Pixels. Each size can be configured as Fill, Fit or Stretch. Inside the PowerToys Settings window, on the Image Resizer tab, you can configure the following settings.Īdd new preset sizes. The idea is that different photos with different orientations will still be the same size. Regardless if this is declared as width or height. In other words: If checked, the smallest number (in width/height) in the settings will be applied to the smallest dimension of the picture. If Ignore the orientation of pictures is checked, the width and height of the specified size may be swapped to match the orientation (portrait/landscape) of the current image. ![]()
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