Free picture editor software for linux

Picture Downloader is an app suitable for downloading pictures from websites. Picture Downloader as the name implies is an application written in C-Sharp and Gtk-Sharp made to automate the process of downloading images from websites, Perfect for TGPs.
Right now Picture Downloader is in a very early stage of development , this means bugs are still there and some features are on their way.
Main features:
- Scan HTML code to extract links to images.
- Save pictures to a desired directory.
- Filter type of pictures (jpg, jpeg, gif, png).
- Can download from secure sites (.htacces, .htpasswd).

View Picture project is an SDL-based image viewer for Linux and FreeBSD that supports slideshows, fullscreen, zoom, and arbitrary movement through the image list.
Main features:
- HTTP updated to 1.1
- Only hide cursor when fullscreen
- Fixed image count estimate
- configure-time X prefix
- fixed potential buffer overflow issues

Zenith Picture Gallery is a feature-rich picture gallery that organizes uploaded images into searchable categories, creates thumbnails, and stores individual statistics for each one.
Other features of Zenith Picture Gallery include downloadable categories and sub-categories, user accounts and profiles, batch adding via FTP and batch deleting, user comments and ratings, the ability to add languages and skins, the option to rebuild thumbnails, an IP blacklist, and a comprehensive admin control panel that provides access to a great deal of settings and formatting options.
Main features:
- Everything is done from the browser, from installation to configuration.
- Searcheable records by filters.
- Auto-resizing/resampling of images to thumbnails.
- Easy skinning.
- Categories and sub-categories with display permission options.
- User accounts, user profiles, control panels and user types.
- Easy management of languages.
- Blacklist containing IPs of troublesome users.
- Admin CP allows you to define countless settings and formatting options.
- A notice appears in the nav bar to admins when there are pictures, comments or users awaiting approval.
- Batch add pictures via FTP.
- Batch delete pictures.
- Rebuild thumbnails tool.
- Search result and display page addresses are linkable.
- Gallery can be turned on/off.
- Adding pictures can be disabled for guests.
- Sort pictures by Last comments, Most viewed, Top rated.
- ZIP and download pictures.
- User accounts, profiles and pictures can all be managed in the Admin CP.
- Option to receive an email when a picture is submitted.
- 21. Option to allow only registered users to view the gallery.
- 22. Option to set a timezone offset for picture submission dates.
- Categories are mapped to directories in the file structure.
- Users can choose a skin from the ones uploaded.
- Forgot my Password and Resend Activation Email tools.
- Admins can define custom fields for pictures.
- EXIF support.

Picture of the Day PHP Script shows daily changing pictures. Each Web page can contain several pictures. Each picture is taken in random order from its own set of directories. An unlimited number of images and directories may be used. Picture of the Day PHP Script doesnt use a database.
Main features:
- Can display several images per page
- Each image is taken from its own set of directories
- Image is randomly taken from directories
- Images are changed daily
- Unlimited number of images
- Unlimited number of directories
- Unlimited number of images per page
- Compatible with Unix and Windows
- Doesnt use database.

libptp2 is a library used to communicate with PTP devices like still imaging cameras or MP3 players (KODAK mc3).
You can download files or tweak camera properties using ptpcam program boundled with libptp2.
Supported Cameras
The list of cameras implementing PTP is constantly growing. Most (if not all) USB still cameras designed after 2002 are supporting PTP. Below is the list of vendors implementing PTP in their cameras:
- Kodak
- HP
- Nikon
- Canon
- Panasonic
- Olympus
- Konica
- Minolta
- Fuji
- Ricoh
- Sony
More are comming...
Please note that if your camera is supporting PTP it does not mean that it is capable of performing all PTP operations (like trigerring capture, uploading files or tweaking properties). Sony cameras are good example of poor PTP implementation where the only thing you can do is downloading files. Sony even breaks the USB specification assigning all its cameras the same product/vendor IDs so dont buy Sony if you want to stay out of problems.
Currently most PTP features are supported. Uploading/downloading files, taking pictures and setting camera properties is supported as long as your camera supports it. However there are many Vendor Extensions that are not supported.
For example Canon uses some proprietary extension operations to take pictures (entering capture mode, extending lens and so on), Nikon introduces proprietary PTP properties.
Unfortunately I have access to couple of Kodak cameras only so to help support extension features you may send me a patch or donate/lend the camera.
Enhancements:
- A number of bugs were fixed, including leaving the camera in an unpredictable state when an I/O error occurs.
- The projects own reimplementation of the old libusb interface (IOCTL_USB_BULK) is used instead of the new URB interface, which is 20% to 50% slower and sometime leads to I/O errors.
- File time preservation across download was added.
- Better capture support was added.
- A bug that caused files over 2MB to be corrupted while downloading was fixed.
- The --loop-capture feature was added.
- Configure errors and parralel build with make -j were fixed.

kpictorial project is a logic game for KDE.

Goal of the game is to reconstruct a black & white picture by the number of contiguous black blocks given for each row and column. Sounds easy but isnt.

You can also use 1bit indexed color palete xmp and xbm files created by the gimp.

JPEG Fit is a PHP class that can be used to optimize images to fit within a given file size limit. The project takes a picture in any format supported by the GD library and generates a JPEG picture with the maximum quality factor that makes the picture file size not exceed a given limit.

This class is similar to the JPEG Reducer class. It uses the binary search algorithm to reach the ideal quality factor in the smallest number of iterations.

The class stops searching when a given number of limit iterations is reached, or when the quality factor difference between the ideal and the found values is less than the configured precision value