Calibration Upload Information
Before uploading images check the following.
- For zoom lenses did you take 10-12 images, each image at a different focal length?
- Were you at least 25 feet (8 meters) from the target?
- Is there a straight continuous feature near the top that runs end-to-end?
- Did you remember not to tilt the camera?
- If your camera supports both Raw and JPEG did you remember to shoot in both modes?
Resize the images so they're about 2000 pixels wide. This size is convenient for calibration and upload times are minimized. If you're using Photoshop sharpen the images and save as JPEG files (medium quality). Do not crop, rotate, correct perspective, or do any other edits except for resizing and sharpening. EXIF information embedded in the image should include camera make, model, and focal length.
For cameras that support Raw images I'll also need a single Raw image, taken at full wide angle, to determine whether or not camera firmware does distortion correction. If examination indicates that correction is done then I'll need original Raw files for the remaining focal lengths.
Upload your images using Dropbox or FTP. After the images have been uploaded contact me via the Feedback page on this site and let me know what camera and lens you used. I'll calibrate your lens and include it in the database for use by other photographers.
Dropbox is a file hosting service with a simple clean interface. After installing the application a Dropbox directory is created on your computer. Any files transferred to this folder are automatically uploaded to the cloud. Install Dropbox on more than one computer and the folders will automatically synchronize between computers.
By default all files in the Dropbox directory are private unless specified otherwise. I use Dropbox to transfer files between my computers (both PC and Mac) and as backup for software project development. To sign up for a Dropbox account click here (first 2GB are free).
To share images for calibration purposes store the images in a folder in the Dropbox directory. If you are submittting images for calibration be sure to resize images to 2000 pixels wide and save at medium resolution before uploading. Downsizing in this manner will result in image files of approximately 200K. For Raw images just upload the original Raw file. Then create a link to the folder following these instructions.
FTP stands for File Transfer Protocol and is commonly used to transfer files. If you are submitting images for calibration be sure to resize images to 2000 pixels wide and save at medium resolution before uploading. Downsizing in this manner will result in image files of approximately 200K. For Raw images just upload the original Raw file. My FTP server has a 500MB capacity so please keep this in mind.
Use an FTP Client such as FileZilla Client (it's free and easy to use) to FTP files to ePaperPress. Choose File > Site Manager and configure as follows:
Then do the following:
- Contact me for the user name and password.
- Upload your images to one of the empty directories.
- After the upload completes send me email and let me know which directory contains your images.
Be sure to do step #3 or your images will just gather dust on my server!