PhotoStamper doesn't modify any single pixel
outside the datestamp area.
Here are examples of some image and its stamped version
A standard approach to stamping is the following.
When image is opened in a graphics editor, the editor performs
JPEG decompression, then a stamp is placed on the image and
the modified image is recompressed again.
Unlike this method, PhotoStamper modifies and reencodes the
stamp area only while leaving the rest intact. (For further
details see technical details)
Images below illustrate the advantage of the lossless
approach over the standard one.
These images represent differences between
the original image and stamped versions for each approach.
Black color corresponds to the unchanged pixels. (The actual
differences are emphasized for easy viewing).
Because of the versatility of the JPEG standard,
a stamp can be removed from the image to restore the original
From the original image file PhotoStamper extracts data which
corresponds to the stamped area and stores it as a custom
JPEG data marker. During restoration, PhotoStamper just substitutes
the stamped area with original data stored in the custom marker.
For further details see technical
into Windows Explorer, so you can always stamp your image
files directly from Explorer window. Just right-click on the
file and pop-up menu will show "PhotoStamper" section
with three options: "Stamp","Undo Stamp"
PhotoStamper features various date/time formats
for different languages. User can select a locale (language
and country) and based on the locale PhotoStamper will suggest
a list of date and time formats. User can pick one of suggested
formats and/or modify format strings.
Examples of different stamps:
Customizable stamp appearance
Use can select stamp position from six predefined
anchor points and adjust horizontal and vertical offsets
from the anchor point. User can also select text font,
size, color and opacity.
PhotoStamper suggests a font for stamp text based
on Language/Country selection.
PhotoStamper can also add a transparent background
area to make stamp reading easier. Background color,
opacity and margins can be specified to achieve best
readability for selected stamp text.
image date and time from EXIF data (if available).
If EXIF data are not available the picture file creation time
is used instead.
Most digital cameras store information about an image
in EXIF format as a part of JPEG file.
See technical details here.