From 7ac390621d829e97f071edaa8a83b7a3447bbedb Mon Sep 17 00:00:00 2001
From: DarthSim <darthsim@gmail.com>
Date: Wed, 14 Nov 2018 17:06:52 +0600
Subject: [PATCH] Flatten image with alpha when saving to jpeg; Make white
 default background

---
 process.go            | 2 +-
 processing_options.go | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/process.go b/process.go
index 46e6c070..cd6d0b7b 100644
--- a/process.go
+++ b/process.go
@@ -336,7 +336,7 @@ func transformImage(ctx context.Context, img **C.struct__VipsImage, data []byte,
 		checkTimeout(ctx)
 	}
 
-	if hasAlpha && po.Flatten {
+	if hasAlpha && (po.Flatten || po.Format == imageTypeJPEG) {
 		if err = vipsFlatten(img, po.Background); err != nil {
 			return err
 		}
diff --git a/processing_options.go b/processing_options.go
index cffce80c..4bea5520 100644
--- a/processing_options.go
+++ b/processing_options.go
@@ -702,6 +702,7 @@ func defaultProcessingOptions(headers *processingHeaders) (*processingOptions, e
 		Enlarge:     false,
 		Quality:     conf.Quality,
 		Format:      imageTypeUnknown,
+		Background:  color{255, 255, 255},
 		Blur:        0,
 		Sharpen:     0,
 		Watermark:   watermarkOptions{Opacity: 1, Replicate: false, Gravity: gravityCenter},