COGenWeb Project City & County of Denver - Photos

Denver, Colorado Photo Album


March 2004 Photos of Denver and Her Residents Last updated on 06/17/2006

We need your photographs!

Your donation of Denver related photos that you have now or take in the future is needed to keep this project growing!

Contributing Scanned Images and Digital Photographs

There are three ways to get your image files to us for uploading:

1. E-Mail - Attach the compressed image files to an email message to along with a note providing the required information. If you chose this method be sure to read the email tips/limits section of this page!

2. Internet - Upload your images to a temporary "public access" Internet directory you have upload permission for. After the files are uploaded, send an email to providing URL of the directory, the required information, and a listing of the individual names vs file names. After I download and process the image files, you can remove the images from the temporary directory.


Email tips and limits:

1. Send only compressed images as email attachments. Your scanner's native BMP or TIFF file is not compressed! Your digital camera image file may or may not be compressed depending on the camera and the options you choose. In either case, JPEG photo image compression is usually provided with the basic photo processing software package provided with your camera or scanner.

2. Limit your email message attachments to a single photo or a group of photo images totaling less than 5 MB per message!

If you have a large number of photographs to send via email, please contact me before sending them. We can work out a coordinated time or times for you to send large file attachments that I can download late at night.

General Tips for Scanning/Digital Photographs:

Image Size/Format: Remember the target media for your photo is display on a computer monitor. For most visitors, that monitor will have a viewable display area of 600x400 pixels. However the 600x400 pixel image size is only a rule of thumb!

File Size and Compression: When I process an image file, my target compressed file size is 50kb. Again that is only a rule of thumb. Some images are quite readable cropped and compressed to 15 kb. Other images with larger formats and more detail produce files as large as 150 kb after compression. We must also remember that the JPEG compression standard actually throws away photo information in the compression process. Applying too much compression results in an image with fuzzy text and blurred details. My personal rule of thumb for "normal" JPEG compression is about 15:1 and I change it as necessary.

Scanner Tips:

Scanner vs Display Resolution: This setting is expressed in dot per inch (dpi) for both media. If you accept your scanner software's default 72 dpi scan resolution for a 3.5 x 5 photograph to be displayed on a monitor, you will wind up with an image that is only about 350x240 pixels. However, I have found that using 150-200 dpi for the scanner resolution usually provides a better starting point (a displayed image 750-1000 pixels wide before cropping). Your scanner software may provide a separate enlargement setting that can be used to adjust display size instead of changing the resolution.

Need Assistance Getting Started?  An excellent scanner tutorial can be fount at A Few Scanning Tips.

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