README: list all types of images with pdfimages

List all types of images with pdfimages since they will be all extracted
in the next command line.

diff --git a/README b/README
index c114880..665b661 100644 (file)
--- a/README
+++ b/README
@@ -11,7 +11,7 @@ Example of use:
 
       1. List all the images:
 
-          $ pdfimages -list uncompressed.pdf > pdfimages.txt
+          $ pdfimages -list -all uncompressed.pdf > pdfimages.txt
 
       2. Extract all the images: