72dpi???

Queries the widely held view that images on the WWW should be 72dpi

Is it true that all images for the Web should have a resolution of 72 dpi?

Not necessarily. Dpi is for printing. It does not matter to screen or web page if you store 72 dpi there, or 7 dpi there or even 7200 dpi there. It simply does not matter what it says there, because on the screen, that number is ignored. The original correct number is no better on the screen, it only affects printing, on paper, where inches exist.

Even Adobe has problem to understand that. Or they give us what we want, as when saved for the web, Photoshop automatically sets the resolution to 72dpi even if it is meaningless and has no effect in any way on the image or what you see. The numbers affects only the future printing resolution and size? My advise is that you take control yourself! The mythical "72" dpi was maybe fairly accurate once on a PC 14 inch 640x480 VGA display, but way off an 17 1280x1024 inch monitor which might have a resolution of 96dpi.

All About Pixels

Explores everything to do with Pixels. From types of pixels to scanning images and files for pringint at specified sizes.

Bob Atkins Photography

Click on Articles and Digital links for Information.

Control of colours on WWW

Contains interesting information about Safari

The truth is that Windows browsers are as color-clueless as they come. To my surprise even the new Internet Explore 8 does not recognize imbedded profiles. They simply throw the raw RGB numbers at the screen with no interpretation. Most monitors have a color range that is somewhere in the vicinity of sRGB. There have been several discussions in different forums regarding color management for web images.

Ethan Hansen wrote once, in Rob Galbraith´s forum: "with some work, you can tame the web for folks who use calibrated monitors and some browsers. On the Mac end, both Safari and IE honour embedded profiles if the correct ColorSync settings are made. On the Windows front, you can use the ColorInfo tag to specify a color space for IE viewing (really only practical for sRGB)."

In the same forum he wrote already 2004-09-24."If you have ColorSync enabled, there is a difference between how Safari and IE handle untagged images on OSX. IE assumes all untagged images are sRGB - a smart choice. Safari assumes that all untagged images are in your monitor color space - no less dumb than using your monitor profile as the default RGB space in Photoshop."

Do you need Photoshop?

An article discussing options vs needs. Very interesting read.

Erasing and Formatting Memory Cards

Erasing and formatting memory cards.

• After you've safely uploaded your digital images to your computer or other device, what do you do with the memory card? Here are a few tips:

• Don't use the computer's software to erase your memory card; always use the camera. That way your card will remain as compatible as possible with your digicam.

When you're on the go and haven't had time to back up all of your pictures, use the "erase all" function on your digital camera. This allows you to recover deleted pictures with recovery software in an emergency.

Formatting Cards - Why you should do it!

Useful habit to get into.

Formatting Cards

A reader asks, "What's with card formatting? Do I really need to do it? I just popped my card into my camera and everything seems to work OK."

Just like computers, memory cards have files systems, folders, etc. When you use your camera to format a card, it sets the card up the way the camera needs it to be in order to function properly

How memory cards become corrupted

Useful info

Causes of memory card corruption

• Turning off a camera before an image is completely written to the memory card.
• Removing the memory card from a camera while an image is being written to the card.
• Removing the card from a memory card reader while files are still being transferred to a computer.
• Batteries conking out as files are being transferred directly from the camera to a computer. Note: always make sure you have fully charged batteries before transferring images.
• Removing the card from a card reader while folders and files from the card are open on a computer.
• Opening, deleting, renaming or moving files on the card while its contents are open on a computer.
• Using a memory card which has not been formatted in the camera. Use the delete/erase function when needed, however a card should be regularly formatted.
• Formatting a card in a computer instead of the camera.
• Inserting a second memory card into a card reader before closing and removing the first when viewing images on the card from a computer.
• Taking photos when camera batteries are nearly empty.
• Taking photos too rapidly so the camera can not complete writing one image before starting the next.
• Continually shooting and deleting, shooting and deleting images when the card is full.
• Letting a memory card get too full before downloading the images to a computer or storage device. Cards that are too full may overwrite the card headers.
• Using a memory card from one camera in a different camera without formatting it in the new camera first.

Lars Ekdahl

Articles and tips.

Photo Notes

Dictionary of film and digital photography.

When I first got started in photography, many years ago, I found learning the basic language very challenging. It was as if the field were a high priesthood, with thick impenetrable walls of jargon and complex concepts. There were a lot of beginners' books, but they often failed to stake out that useful middle ground between spoonfeeding and academic abstraction. I wanted to go out and take photos, but I also wanted to know the language to describe what I was doing.

Shoot Smarter

Need to register but site contains lots of interesting info for the digital shooter and image editor.

Steve Hoffmann

Articles and tips.

The Society for Imaging Science and Technology

The Society for Imaging Science and Technology is an international non-profit organisation whose goal is to keep members aware of the latest scientific and technological developments in the field of imaging through conferences, journals and other publications. We focus on imaging in all its aspects, with particular emphasis on silver halide, digital printing, electronic imaging, photofinishing, image preservation, image assessment, pre-press technologies and hybrid imaging systems.

Universal Photographic Digital Imaging Guidelines

Universal Digital Imaging Guidelines - useful if you aim to sell your images to stock agencies or directly to the media for publication.