Photo Manipulating Tools

photo management and camera download by date

Newsgroups: gmane.linux.debian.user
Date: 2006-05-24

*Tags*: rename jpeg image by date/timestamp

> What I do is first copy the images to my system. Then I use a program
> called exiv2 to automatically rename the files using the timestamp as
> stored in their EXIF data. I suggest you do a 'wajig install exiv2' (or
> more probably 'apt-get install exiv2') and a man exiv2 to find out if
> this program meets your needs. It just might...

The jhead does the same thing. This takes all the jpg files and renames them to ISO format based upon EXIF timestamp:

jhead -nf%Y%m%d-%H%M%S *.[Jj][Pp][Gg]

Preparing photos for a web photo album

http://www.valibuk.net/?p=34

A few tips how to prepare photos for a web photo album:

Make a copy of the picture that you would like to have on web. The following steps include instructions that will irreversibly change your photos.
Rotate them correctly. A lot of cameras writes an information about the rotation into the header of a image file (one of the EXIF values). Unfortunately not all web albums can recognise this information correctly.
```
Install the jhead application and type this:
```
```
jhead -autorot photo.jpg
```
Remove unnecessary data. My Canon camera saves also a thumbnail of the photo into the image file, that is cca 10kB. It is completely useless for a web album (it will create its own thumbnails anyway).
```
It is easy to remove it with the jhead application:
```
```
jhead -dt photo.jpg
```
```
Of course, the first and the second step can be done together for all
your pictures:
```
```
jhead -dt -autorot *
```
Reduce the resolution. If you do not need to publish your photos in the full resolution (no, you do not need, indeed ;), it is a good idea to reduce the resolution to save visitor's time and bandwidth.
```
I like the mogrify application from the ImageMagick package. The
following line reduces the resolution to 1024x768 and reduces the JPEG
quality to 70%:
```
```
mogrify -resize 1024x768 -quality 70 *
```