Rosemary asked about reducing the byte size of a 546kb image for displaying on her website. Others have given good suggestions. To summarize, there are only three ways to cut a raster image file's size: 1. Reduce the dimensions. A 8" by 8" image needs (other things being equal) four times as many bytes as a 4" by 4". This isn't done by specifying display size in the HTML page, but to the file itself with a graphics-editing program. The saving is proportional to the products of the before & after dimensions. 2. Reduce the resolution. Any resolution greater than, say, 100 pixels per inch is wasted; computer monitors can't display the extra pixels and many are limited to 72. The saving is proportional to the ratio of the before & after resolutions. 3. Convert to gray-scale, especially if the original is in monochrome (black & white). A typical color image requires 24 (or more) bits per pixel; gray scale requires 8 bits (1 byte), a saving of two-thirds or more on the file size. For documents, there is a non-image approach: Transcribe the document into text. This will produce the greatest savings of all. -rt_/)

Hi Ralph, Thank you for your reply. A further question: how do you reduce the resolution? I can't re-scan the original and although I've hunted through PSP's "help" files I can't see anything that seems to fit my problem. Most of the instructions there are about setting the resolution on the printer. Although I just asked about one image I have several dozen that I want to eventually upload to the site - all with a similar problem. So I would like to find a generic solution if possible. Kind regards, Rosemary ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ On 02/11/2010 20:18, Ralph Taylor wrote: > Rosemary asked about reducing the byte size of a 546kb image for displaying > on her website. > > Others have given good suggestions. To summarize, there are only three ways > to cut a raster image file's size: > > 1. Reduce the dimensions. A 8" by 8" image needs (other things being equal) > four times as many bytes as a 4" by 4". This isn't done by specifying > display size in the HTML page, but to the file itself with a > graphics-editing program. The saving is proportional to the products of the > before& after dimensions. > > 2. Reduce the resolution. Any resolution greater than, say, 100 pixels per > inch is wasted; computer monitors can't display the extra pixels and many > are limited to 72. The saving is proportional to the ratio of the before& > after resolutions. > > 3. Convert to gray-scale, especially if the original is in monochrome (black > & white). A typical color image requires 24 (or more) bits per pixel; gray > scale requires 8 bits (1 byte), a saving of two-thirds or more on the file > size. > > For documents, there is a non-image approach: Transcribe the document into > text. This will produce the greatest savings of all. > > -rt_/)