windows picture and fax viewer windows 7

The CCD/CMOS sensor hardware is designed to stream raw data in a particular direction (e.g. A flag is set to indicate to the viewing software / LCD preview which way to rotate the image before display, rather than rotating the image content itself.Īs lossless image rotation is a fairly compute-intensive operation, digital cameras are not likely to include true lossless rotation after capturing the photo. While your digital camera may include an option to 'auto-rotate images' due to the camera's orientation, this is almost always just a 'virtual rotation'.

NOTE: Values with '*' are uncommon since they represent 'flipped' orientations. The values 1-8 represent the following descriptions (as shown by utilities that support EXIF field decode): EXIF Orientation Value Unless the camera were to encode the image right-to-left or know that you were taking a photo in a mirror, I don't see how these values will ever be used.įor the following discussion, it may be helpful to understand the concepts behind lossless rotation. The other four settings would imply that the resulting image was flipped horizontally before recording. Note that one would only expect the four orientation settings shown on the left to be possible with a digital camera. Note: Previous orientation image can be seen here It is presumably a 2-axis tilt sensor, allowing 4 possible orientations to be detected (shown in the left side of the diagram below). Canon calls their sensor the 'Intelligent Orientation' sensor. The output of this sensor is used to set the EXIF orientation flag in the image file's metatdata to reflect the positioning of the camera with respect to the ground. Virtually all Canon and Nikon digital cameras have an orientation sensor. Many newer digital cameras (both dSLR and Point & Shoot digicams) have a built-in orientation sensor.

Windows picture and fax viewer windows 7