On 11/4/2003 9:58:07 PM, Ian Binnie wrote:
>Exif encoded images contain an APP1 block which contains digicam information.
>This block is encoded in TIFF format.
>While the Exif specification states that thumbnails are optional, most cameras insert a thumbnail.
>This is a complete jpeg ff d8 ... ff d9.
>These can be extracted easily by Vedit and saved as a jpeg.
>If you search for ff c0 you will normally find this thumbnail.
I checked some digital camera pictures, and, indeed, they may contain multiple SOF markers.
In JFIF files, the thumbnails are usually not stored in JPEG format, but the new JFIF v1.02 spec does allow this option, too.
By the way, do you have a web page from where your EXIF extracting macro can be downloaded? Is it possible to edit and write the EXIF data, too?