A nodejs wrapper that generating bpg image files by using pre-compiled libbpg binary.
For more information about libbpg, please visit (http://bellard.org/bpg/).
Require: node >=6
npm install --save node-bpg
const { encode } = require('node-bpg'); const option = { qp: 10, // set quantizer parameter level: 9 // select the compression level }; encode('input.jpg', 'output.bpg', option) .then(() => { // done });
const { decode } = require('node-bpg'); const option = { bit_depth: 16 // set bit_depth per component (PNG output only) }; decode('input.bpg', 'output.png', option) .then(() => { // done });
qp set quantizer parameter (smaller gives better quality, range: 0-51, default = 28)
cfmt set the preferred chroma format (420, 422, 444, default = 420)
color_space set the preferred color space (ycbcr, rgb, ycgco, ycbcr_bt709, ycbcr_bt2020, default = ycbcr)
bit_depth set the bit depth (8 to 12, default = 8)
lossless enable lossless mode
encoder select the HEVC encoder (jctvc, default = jctvc)
level select the compression level (1 = fast, 9 = slow, default = 8)
Advanced options:
alphaq set quantizer parameter for the alpha channel (default = same as qp value)
premul store the color with premultiplied alpha
limitedrange encode the color data with the limited range of video
hash include MD5 hash in HEVC bitstream
keepmetadata keep the metadata (from JPEG: EXIF, ICC profile, XMP, from PNG: ICC profile)
verbose show debug messages
or refer to default option.
bit_depth PNG output only: use bit_depth per component (8 or 16, default = 8)
information display information about the image
npm test
In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code.
MIT