![]() We can get 35 mm equivalent number from the camera sensor size. 35 mm (also called full frame) is the traditional film size having an area of 36mm x 24mm (43.3 mm dia). The EXIF data for cameras give the actual focal length of an image irrespective of whether the sensor is full frame or not, but for comparative study it might be required to get the 35 mm equivalent focal length. * EXIF and XMP are independent metadata, with the latter created by Adobe and former more commonly used by digital cameras. So if your workflow involves editing with GIMP or some other heavy duty image editor before (which is obvious) experimenting with the “effects” in Picasa, and you are running Picasa above 3.6, then uncheck this box in GIMP to avoid this error later when you save it in Picasa. In GIMP, this can be done by simply unchecking the “Save XMP data” box in the “Advanced Options”, when an image is exported as JPEG (you can still retain the EXIF* info by keeping that option checked): ![]() In this way, there is no XMP parsing issues and Picasa saves the file correctly. This error can be avoided if in the first application we remove the XMP data from the JPEG file, then open it with Picasa. Many image editing software do the same, but with Picasa there seems to be a fault that prevents one of the very basic functionalities of an image editing application – i.e. ![]() The issue is probably with the way Picasa parses the XMP data and tries to write something in the metadata that states the image was last edited with it. Google product forums suggest the issue is there for a while. Obviously, the issue is present on both Windows and Linux (i.e. The error message wrongly says disk error, when the actual cause is XMP data that was saved with that JPEG file using some other editor (GIMP, for example) before opening it in Picasa. Picasa 3.9 (according to some forums, any version >3.6) throws an annoying error (code #2000009) on saving some JPEG files, if one wishes to save the edits done in Picasa on that file.
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