Index: libjpeg8-8d1/jpegtran.1
===================================================================
--- libjpeg8-8d1.orig/jpegtran.1	2009-12-28 20:38:22.000000000 +0100
+++ libjpeg8-8d1/jpegtran.1	2014-06-23 18:15:12.940161756 +0200
@@ -19,6 +19,10 @@
 perform some rearrangements of the image data, for example turning an image
 from landscape to portrait format by rotation.
 .PP
+For EXIF files and JPEG files containing Exif data, you may prefer to use
+.B exiftran
+instead.
+.PP
 .B jpegtran
 works by rearranging the compressed data (DCT coefficients), without
 ever fully decoding the image.  Therefore, its transformations are lossless:
@@ -28,7 +32,11 @@
 .B cjpeg
 to accomplish the same conversion.  But by the same token,
 .B jpegtran
-cannot perform lossy operations such as changing the image quality.
+cannot perform lossy operations such as changing the image quality.  However,
+while the image data is losslessly transformed, metadata can be removed.  See
+the
+.B \-copy
+option for specifics.
 .PP
 .B jpegtran
 reads the named JPEG/JFIF file, or the standard input if no file is
@@ -198,16 +206,17 @@
 .TP
 .B \-copy none
 Copy no extra markers from source file.  This setting suppresses all
-comments and other excess baggage present in the source file.
+comments and other metadata in the source file.
 .TP
 .B \-copy comments
 Copy only comment markers.  This setting copies comments from the source file,
-but discards any other inessential (for image display) data.
+but discards any other metadata.
 .TP
 .B \-copy all
-Copy all extra markers.  This setting preserves miscellaneous markers
+Copy all extra markers.  This setting preserves metadata
 found in the source file, such as JFIF thumbnails, Exif data, and Photoshop
-settings.  In some files these extra markers can be sizable.
+settings.  In some files these extra markers can be sizable.  Note that this
+option will copy thumbnails as-is; they will not be transformed.
 .IP
 The default behavior is
 .BR "\-copy comments" .
