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ImageCacheService: improve quality by using PNG and improving downscale filtering

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This commit is contained in:
Lemmy
2026-01-07 10:43:11 -05:00
parent 0f988cc49c
commit 247b1cc8a2
1 changed files with 6 additions and 6 deletions
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Services/UI/ImageCacheService.qml
+6 -6
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@@ -85,7 +85,7 @@ Singleton {
getMtime(sourcePath, function (mtime) {
const cacheKey = generateThumbnailKey(sourcePath, mtime);
const cachedPath = wpThumbDir + cacheKey + ".jpg";
const cachedPath = wpThumbDir + cacheKey + ".png";
processRequest(cacheKey, cachedPath, sourcePath, callback, function () {
if (imageMagickAvailable) {
@@ -132,7 +132,7 @@ Singleton {
getMtime(sourcePath, function (mtime) {
const cacheKey = generateLargeKey(sourcePath, width, height, mtime);
const cachedPath = wpLargeDir + cacheKey + ".jpg";
const cachedPath = wpLargeDir + cacheKey + ".png";
processRequest(cacheKey, cachedPath, sourcePath, callback, function () {
startLargeProcessing(sourcePath, cachedPath, targetWidth, targetHeight, cacheKey);
@@ -269,7 +269,8 @@ Singleton {
const srcEsc = sourcePath.replace(/'/g, "'\\''");
const dstEsc = outputPath.replace(/'/g, "'\\''");
const command = `magick -define jpeg:size=768x768 '${srcEsc}' -auto-orient -thumbnail '384x384^' -gravity center -extent 384x384 -quality 85 '${dstEsc}'`;
// Use Lanczos filter for high-quality downscaling, subtle unsharp mask, and PNG for lossless output
const command = `magick '${srcEsc}' -auto-orient -filter Lanczos -resize '384x384^' -gravity center -extent 384x384 -unsharp 0x0.5 '${dstEsc}'`;
runProcess(command, cacheKey, outputPath, sourcePath);
}
@@ -280,10 +281,9 @@ Singleton {
function startLargeProcessing(sourcePath, outputPath, width, height, cacheKey) {
const srcEsc = sourcePath.replace(/'/g, "'\\''");
const dstEsc = outputPath.replace(/'/g, "'\\''");
const doubleWidth = width * 2;
const doubleHeight = height * 2;
const command = `magick -define jpeg:size=${doubleWidth}x${doubleHeight} '${srcEsc}' -auto-orient -thumbnail '${width}x${height}^' -quality 95 '${dstEsc}'`;
// Use Lanczos filter for high-quality downscaling, subtle unsharp mask, and PNG for lossless output
const command = `magick '${srcEsc}' -auto-orient -filter Lanczos -resize '${width}x${height}^' -unsharp 0x0.5 '${dstEsc}'`;
runProcess(command, cacheKey, outputPath, sourcePath);
}