Mathis/sharp
1
0
Fork 0
mirror of https://github.com/lovell/sharp.git synced 2025-12-19 15:25:07 +01:00
Code Issues Packages Projects Releases Wiki Activity

Set PNG bitdepth based on number of colours #2855

Browse Source 
Removes use of deprecated libvips API
This commit is contained in:
Lovell Fuller
2021-08-26 22:05:29 +01:00
parent 4e84f743e4
commit 3402656ec5
5 changed files with 12 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
lib/constructor.js
View File

@@ -232,7 +232,7 @@ const Sharp = function (input, options) {
pngAdaptiveFiltering: false,
pngPalette: false,
pngQuality: 100,
pngColours: 256,
pngBitdepth: 8,
pngDither: 1,
webpQuality: 80,
webpAlphaQuality: 100,

2
lib/output.js
View File

@@ -405,7 +405,7 @@ function png (options) {
const colours = options.colours || options.colors;
if (is.defined(colours)) {
if (is.integer(colours) && is.inRange(colours, 2, 256)) {
this.options.pngColours = colours;
this.options.pngBitdepth = 1 << 31 - Math.clz32(Math.ceil(Math.log2(colours)));
} else {
throw is.invalidParameterError('colours', 'integer between 2 and 256', colours);
}