Merge branch 'master' into version/4

processing/colorspace_to_processing.go

@@ -0,0 +1,42 @@
+package processing
+
+import (
+	"github.com/imgproxy/imgproxy/v3/config"
+	"github.com/imgproxy/imgproxy/v3/imagedata"
+	"github.com/imgproxy/imgproxy/v3/options"
+	"github.com/imgproxy/imgproxy/v3/vips"
+)
+
+func colorspaceToProcessing(pctx *pipelineContext, img *vips.Image, po *options.ProcessingOptions, imgdata imagedata.ImageData) error {
+	if img.ColourProfileImported() {
+		return nil
+	}
+
+	if err := img.Rad2Float(); err != nil {
+		return err
+	}
+
+	convertToLinear := config.UseLinearColorspace && (pctx.wscale != 1 || pctx.hscale != 1)
+
+	if img.IsLinear() {
+		// The image is linear. If we keep its ICC, we'll get wrong colors after
+		// converting it to sRGB
+		img.RemoveColourProfile()
+	} else {
+		// vips 8.15+ tends to lose the colour profile during some color conversions.
+		// We need to backup the colour profile before the conversion and restore it later.
+		img.BackupColourProfile()
+
+		if convertToLinear || !img.IsRGB() {
+			if err := img.ImportColourProfile(); err != nil {
+				return err
+			}
+		}
+	}
+
+	if convertToLinear {
+		return img.LinearColourspace()
+	}
+
+	return img.RgbColourspace()
+}