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-rw-r--r--Build/source/texk/web2c/luatexdir/image/writejpg.w4
1 files changed, 4 insertions, 0 deletions
diff --git a/Build/source/texk/web2c/luatexdir/image/writejpg.w b/Build/source/texk/web2c/luatexdir/image/writejpg.w
index cb4cd673ae8..bfb218fdc46 100644
--- a/Build/source/texk/web2c/luatexdir/image/writejpg.w
+++ b/Build/source/texk/web2c/luatexdir/image/writejpg.w
@@ -291,6 +291,10 @@ void read_jpg_info(PDF pdf, image_dict * idict, img_readtype_e readtype)
img_yres(idict) = (int) read2bytes(img_file(idict));
switch (units) {
case 1:
+ if ((img_xres(idict) == 1) || (img_yres(idict) == 1)) {
+ luatex_warn("The image specifies an unusual resolution of %ddpi by %ddpi. ",
+ img_xres(idict), img_yres(idict));
+ }
break; /* pixels per inch */
case 2:
img_xres(idict) = (int) ((double) img_xres(idict) * 2.54);