diff --git a/Makefile.inc b/Makefile.inc
index 414ef76c10..b5665a79e0 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -356,6 +356,41 @@ cbfs-files-processor-struct= \
 		rm -f $(2).tmp) \
 	$(eval DEPENDENCIES += $(2).d)
 
+#######################################################################
+# Convert image to YCC 4:2:0 JPEG
+#
+# In two steps:
+# 1. Convert to RGB colors, optionally resize and store as BMP.
+# 2. Round final size to multiples of 16, optionally swap colors,
+#    convert (back) to sRGB and store as JPEG.
+# The split is necessary because we don't know the exact, scaled
+# size due to aspect-ratio. Note: IM v7 would allow us to do the
+# calculations in one command using %[fx:...] syntax.
+#
+# arg1: image input file
+# arg2: output jpg
+cbfs-files-processor-jpg420= \
+	$(eval $(2): $(1) $(KCONFIG_AUTOCONFIG);				\
+		printf "    CONVERT    $$<\n";					\
+		res=$(CONFIG_BOOTSPLASH_CONVERT_RESOLUTION);			\
+		res=$$$$(convert $$<						\
+			-colorspace RGB						\
+			$$(BOOTSPLASH_RESIZE-y)					\
+			-format '%wx%h' -write info:				\
+			bmp:$$@);						\
+		convert $$@							\
+			$$(BOOTSPLASH_ROUND16)					\
+			$$(BOOTSPLASH_COLORSWAP-y)				\
+			-colorspace sRGB					\
+			-quality $$(CONFIG_BOOTSPLASH_CONVERT_QUALITY)%		\
+			-interlace none -colorspace YCC -sampling-factor 4:2:0	\
+			jpg:$$@)
+BOOTSPLASH_FLOOR = $$(($${res%%x*} & ~15))x$$(($${res\#\#*x} & ~15))
+BOOTSPLASH_RESIZE-$(CONFIG_BOOTSPLASH_CONVERT_RESIZE) = -resize $(BOOTSPLASH_FLOOR)
+BOOTSPLASH_CEIL = $$((($${res%%x*} + 15) & ~15))x$$((($${res\#\#*x} + 15) & ~15))
+BOOTSPLASH_ROUND16 = -background black -gravity center -extent $(BOOTSPLASH_CEIL)
+BOOTSPLASH_COLORSWAP-$(CONFIG_BOOTSPLASH_CONVERT_COLORSWAP) := -channel-fx 'red<=>blue'
+
 #######################################################################
 # Add handler for arbitrary files in CBFS
 $(call add-special-class,cbfs-files)
@@ -1281,10 +1316,19 @@ cbfs-files-y += build_info
 build_info-file := $(obj)/build_info
 build_info-type := raw
 
+ifeq ($(CONFIG_BOOTSPLASH_CONVERT),y)
+ifeq ($(shell command -v convert),)
+$(error CONFIG_BOOTSPLASH_CONVERT requires the convert program (part of ImageMagick))
+endif
+cbfs-files-$(CONFIG_BOOTSPLASH_IMAGE) += bootsplash.jpg
+bootsplash.jpg-file := $(call strip_quotes,$(CONFIG_BOOTSPLASH_FILE)):jpg420
+bootsplash.jpg-type := bootsplash
+else
 BOOTSPLASH_SUFFIX=$(suffix $(call strip_quotes,$(CONFIG_BOOTSPLASH_FILE)))
 cbfs-files-$(CONFIG_BOOTSPLASH_IMAGE) += bootsplash$(BOOTSPLASH_SUFFIX)
 bootsplash$(BOOTSPLASH_SUFFIX)-file := $(call strip_quotes,$(CONFIG_BOOTSPLASH_FILE))
 bootsplash$(BOOTSPLASH_SUFFIX)-type := bootsplash
+endif
 
 # Ensure that no payload segment overlaps with memory regions used by ramstage
 # (not for x86 since it can relocate itself in that case)
diff --git a/src/Kconfig b/src/Kconfig
index f5ba4fc784..ea6f341f78 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -447,7 +447,54 @@ config BOOTSPLASH_FILE
 	# Default value set at the end of the file
 	help
 	  The path and filename of the file to use as graphical bootsplash
-	  screen. The file format has to be jpg.
+	  screen. The file format has to be JPEG with YCC 4:2:0 color sampling
+	  unless converted with "Pre-process bootsplash file with ImageMagick".
+
+	  The image can only be displayed by coreboot if it's smaller or has
+	  the same size as the framebuffer resolution. Width and height have
+	  to be a multiple of 16 pixels.
+
+	  Setting these constraints allows a leaner implementation in coreboot.
+	  The minimum necessary ImageMagick command line seems to be:
+	  $ convert input.img -colorspace YCC -sampling-factor 4:2:0 bootsplash.jpg
+
+config BOOTSPLASH_CONVERT
+	bool "Pre-process bootsplash file with ImageMagick"
+	depends on BOOTSPLASH_IMAGE
+	help
+	  Use ImageMagick (`convert` program) to convert a bootsplash image
+	  to the supported JPEG format.
+
+config BOOTSPLASH_CONVERT_QUALITY
+	int "Bootsplash JPEG target quality (%)"
+	depends on BOOTSPLASH_CONVERT
+	range 1 100
+	# Default value set at the end of the file
+
+config BOOTSPLASH_CONVERT_RESIZE
+	bool "Resize bootsplash image"
+	depends on BOOTSPLASH_CONVERT
+	help
+	  Resize the image to the given resolution. Aspect ratio will be kept,
+	  adding black bars as necessary.
+
+config BOOTSPLASH_CONVERT_RESOLUTION
+	string "Bootsplash image target size"
+	depends on BOOTSPLASH_CONVERT_RESIZE
+	# Default value set at the end of the file
+	help
+	  Target image resolution given as <width>x<height>, e.g. 1024x768.
+	  Values not divisible by 16 will be rounded down.
+
+	  When using coreboot to display the bootsplash image (CONFIG_BOOTSPLASH),
+	  set this lower or equal to the minimum resolution you expect.
+
+config BOOTSPLASH_CONVERT_COLORSWAP
+	bool "Swap red and blue color channels"
+	depends on BOOTSPLASH_CONVERT
+	help
+	  The JPEG decoder currently ignores the framebuffer color order.
+	  If your colors seem all wrong, try this option.
 
 config FW_CONFIG
 	bool "Firmware Configuration Probing"
@@ -1444,6 +1491,14 @@ config BOOTSPLASH_FILE
 	depends on BOOTSPLASH_IMAGE
 	default "bootsplash.jpg"
 
+config BOOTSPLASH_CONVERT_QUALITY
+	depends on BOOTSPLASH_CONVERT
+	default 80
+
+config BOOTSPLASH_CONVERT_RESOLUTION
+	depends on BOOTSPLASH_CONVERT_RESIZE
+	default "1024x768"
+
 config CBFS_SIZE
 	default ROM_SIZE