1000D RAW image size??

[Merlin66]

Canon Utilities is set to open when camera is connected...but it comes up with an error message "Camera is not recognised " ; when I then double click and open Utilities it sees the 1000D immediately and everything is OK...why is this so??

Using the latest(?) V2.4.01 of Utilities....

Also, utilities says the RAW file (.CR2) is 3888 x 2592 pixels, but when I open the same file in AstroArt4 it says, and measures it, at 3906 x 2602 ?????

why is this so???

[Merlin66]

I've just upgraded to Utilities V2.8.0.1......

Still the same results???

[Psychobilly]

The physical sensor is larger than the area used to produce images... IIRC some pixels are masked off to allow the camera to make sensor measurements and to "align" the sensor.. for some reason astro art is giving you the whole "physical" sensor whilst the canon utils (and I suspect Adobe Camera Raw) will only give you the "image" pixels...

Found this it comes from http://www.wildtramper.com/sw/cr2/cr2.html

* The size of the decompressed image is slightly larger than the final image

* size. A few extra 'black' rows added on top and bottom and a few extra

* 'black' columns may be added to the left and right (but none have been

* observed). These 'black' rows/columns along with a few additional RG/GB

* rows/columns make up a set of Trim rows/columns which are ultimately deleted

* to get the final 'as advertised' RAW image size. Other than noting that some

* of the Trim is 'black,' it is beyond the scope of this description to

* determine the method to find the optimum Trim rows/columns. As an

* observation, customized Trim may (or it may not) be encoded in the Firmware

* of camera so that that the final calibration of the image sensor reflects

* this Trim in a manner that places the center of the image sensor at the lens

* center.

Peter...