Jpg compression varies depending on the content of the picture. Lots of areas of continuous tone compress far better than something with lots of detail or lots of grain/noise for example. The camera doesn't know in advance how small it will be able to make the files, so assumes that they will all be max size (6Mb I think) so that it doesn't tell you there are more shots available than is possible. As you fill the card, the camera adjusts for the extra space, so after 46 shots which are 3MB (the equivalent of 23 at 6Mb), the camera would probably show 24 shots left.
> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Sent: 20 October 2003 15:34 > To: [EMAIL PROTECTED] > Subject: File size and capacity ? > > > Ok here are the facts: > * Camera - *ist D > * CF card - Lexar 256 MB 12X > * Camera shows 57 available shots when card is empty and the > camera is in best (***) JPEG mode. > * I filled up the card until it the camera showed 0 available shots. > * I downloaded the shots into a folder on my computer. > * I was shooting in best JPEG > * The Pentax photo browser confirms the shots were taken in > Best JPEG mode, they are all 3008 x 2008 pixels. > * There is ZERO chance I put any other shots in this folder. > > Now the problem. I have 101 shots in this folder. How did > that happen? > > The Computer shows the files to vary in size by as much as > one MB from about 1.9 - 3.02. > > C onfused ry > > > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.528 / Virus Database: 324 - Release Date: 10/16/2003 > >
