Message-Id: <mailto:199507251820.NAA24238@library.wustl.edu> Date: Tue, 25 Jul 1995 10:52:37 -0500 From: Mia Massicotte <mailto:miamass@VAX2.CONCORDIA.CA> Subject: Advice requested for scanning to PhotoCD To: Multiple recipients of list IMAGELIB
I need some advice, and I hope that I'm directing these questions to the appropriate place.We have had a professional photographer take some shots of our library for a virtual tour project that I'm putting together. I want him to put the images on a PhotoCD, which I will later manipulate on a Mac with Photoshop, and mount them on our Mac webserver. I would like one high quality archival image for posterity, one image at 72 dpi for the webserver and subsequent screen viewing, and one thumbnail.
My questions are:
1a. For the image at 72 dpi, I don't want to have to resize or crop these images when I place them into my web pages. I think l want the images to be approx 4" h x 5 inches wide when displayed on a monitor. I've been told I need to specify to the lab that something called the 'aspect ratio' should be 4x5 for 35 mm film. This should result in an on-screen image of 300 w by 200 h pixels. Is my information correct?
1b. If I want the 72 dpi images instead to display on screen (without cropping) at a size of say, 3" high by 4" wide, how should I specify this to the lab making the CD?
2. For the 72 dpi image, I assume that the image would be in PICT format on the CD. If I then convert the 72 dpi image to jpeg for my web project, will this result in too great a loss of quality? Should I try to convert the archival image to a 72 dpi jpeg instead? Any suggestions?
3. Initially, I used Apple's QuickTake digital camera for some quick and dirty prototyping. I noticed that displaying the photos (I had converted from pict to gif for the test) on Mac monitors (475's, 575's, Powermacs) looked acceptable; but on PC monitors were way too dark. Is this darkness a function of the PC monitor's capability, or did it have more to do with the gif compression? Will I run into a similar problem with my jpeg images, and if so, can it be avoided?
The bottom line is that I want the highest quality image that I can get from the original, to mount on my Mac webserver, for monitor display at 72 dpi, with an on-screen size of about 300 pixels wide by 200 pixels high.
Many thanks in advance for any tips or recommendations you can suggest.
Mia Massicotte, Systems Librarian Concordia University Library, Montreal, Quebec CANADA mailto:miamass@vax2.concordia.ca