[WinMac] Re: Rule of thumb

From: Leonard Rosenthol (leonardr[at]lazerware.com)
Date: Fri Dec 29 2000 - 11:40:36 PST

  • Next message: Dan Schwartz: "RE: [WinMac] Re: Rule of thumb"

    At 1:16 PM -0500 12/29/00, Mark Workman wrote:
    >We use 350 pixel/inch CMYK images and the size in megs is pretty close to
    >half the size of the image in square inches. Makes for easy math.

            You could just use the actual numbers and do the math.

    Each pixel in an image is either 3 (RGB) or 4 (CMYK or RGB w/alpha)
    bytes in size. Multiple that times the number of columns (image
    width) and then that times the number of rows (image height).

    I missed Dan spouting drech again, didn't I...
    >Even using the 28 megabyte figure, that's 84 megabytes of free RAM
    >(installed RAM minus operating system minus Photoshop); which puts
    >what you need somewhere between 128 and 192 MB of installed RAM.
    >
            Dan seems to be forgetting that Photoshop does NOT
    NECESSARILY load an image entirely into RAM, it uses a VERY
    sophisticated virtual memory system of it's own to handle images.
    So any calculations involving images and Photoshop aren't guaranteed
    to be accurate. HOWEVER, I agree that more RAM is always better when
    working with Photoshop!

    Leonard 

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