added JPEG rotation question

git-svn-id: https://svn.code.sf.net/p/gphoto/code/trunk/libgphoto2@4837 67ed7778-7388-44ab-90cf-0a291f65f57c

1 files changed, 14 insertions, 2 deletions

diff --git a/doc/FAQ b/doc/FAQ
index db07cc376..f918f138f 100644
--- a/doc/FAQ
+++ b/doc/FAQ
@@ -25,8 +25,8 @@ Q: I get the error message
    *** Error ('Could not claim the USB device') ***
 
    Could not claim interface 0 (Operation not permitted). Make sure no
-   other program or kernel module (e.g. dc2xx or stv680) is using the device and
-   you have read/write access to the device. 
+   other program or kernel module (e.g. dc2xx or stv680) is using the 
+   device and you have read/write access to the device. 
 
    What can I do to make it work?
 
@@ -134,3 +134,15 @@ A: We don't have the money to buy Windows and something like Visual C.
         us the patches.
 
 ========================================================================
+
+Q: What's the best way to rotate downloaded JPEG images w/o losses?
+
+A: If you do not care about EXIF information:
+
+      jpegtran -copy all -rotate 90
+
+   If you want to preserve EXIF information:
+
+      jhead -cmd 'jpegtran -rotate 90 -outfile &o &i' my-pic.jpg
+
+========================================================================