Re: OT: Canon JPG files changed by Photoshop?
A simple thing to do would be to run EXIFTool on both the original image files and the ones that had been opened by Photoshop, see what had changed. I am sure that Photoshop wouldn't change the actual JPEG data but some change to the metadata isn't hard to imagine. Godfrey 2008/2/9, Derby Chang [EMAIL PROTECTED]: Sort of OT, but this puzzles me. My friend as a little Canon PS. She recently took a few pics that she wanted to print straight away. So she pulled the card out, opened a few of the pics from the card (knowing she shouldn't do this, but she was in a rush) in Photoshop, and printed them. Didn't save, and the Date/Time Modified of the files on the card are still the same as the Create Date. But sticking the card back into the Canon, she gets an Unrecognized file format error on just the JPGs she opened. We copied the files back onto her laptop, and the JPGs are fine. What's going on there? -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: Canon JPG files changed by Photoshop?
I believe the file system change the last opened date in the file allocation table each time a file is opened. Maybe the camera doesn't like discrepancy between last opened and last saved, I dunno... Jostein 2008/2/9, Derby Chang [EMAIL PROTECTED]: Sort of OT, but this puzzles me. My friend as a little Canon PS. She recently took a few pics that she wanted to print straight away. So she pulled the card out, opened a few of the pics from the card (knowing she shouldn't do this, but she was in a rush) in Photoshop, and printed them. Didn't save, and the Date/Time Modified of the files on the card are still the same as the Create Date. But sticking the card back into the Canon, she gets an Unrecognized file format error on just the JPGs she opened. We copied the files back onto her laptop, and the JPGs are fine. What's going on there? D -- [EMAIL PROTECTED] http://members.iinet.net.au/~derbyc -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- http://www.alunfoto.no/galleri/ http://alunfoto.blogspot.com -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: Canon JPG files changed by Photoshop?
I don't know if it matters if this is Mac or PC, but I think just opening it Photoshop makes a thumnail icon or a Photoshop jpg icon that goes with the file rather than the generic jpg icon it had ... even without saving it, that might be enough for the camera not to like it. Maybe someone else has a better technical explanation? Joe On Feb 8, 2008, at 11:58 PM, Derby Chang wrote: Sort of OT, but this puzzles me. My friend as a little Canon PS. She recently took a few pics that she wanted to print straight away. So she pulled the card out, opened a few of the pics from the card (knowing she shouldn't do this, but she was in a rush) in Photoshop, and printed them. Didn't save, and the Date/Time Modified of the files on the card are still the same as the Create Date. But sticking the card back into the Canon, she gets an Unrecognized file format error on just the JPGs she opened. We copied the files back onto her laptop, and the JPGs are fine. What's going on there? D -- [EMAIL PROTECTED] http://members.iinet.net.au/~derbyc -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
OT: Canon JPG files changed by Photoshop?
Sort of OT, but this puzzles me. My friend as a little Canon PS. She recently took a few pics that she wanted to print straight away. So she pulled the card out, opened a few of the pics from the card (knowing she shouldn't do this, but she was in a rush) in Photoshop, and printed them. Didn't save, and the Date/Time Modified of the files on the card are still the same as the Create Date. But sticking the card back into the Canon, she gets an Unrecognized file format error on just the JPGs she opened. We copied the files back onto her laptop, and the JPGs are fine. What's going on there? D -- [EMAIL PROTECTED] http://members.iinet.net.au/~derbyc -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: OT: Canon JPG files changed by Photoshop?
There are several variations on the Jpeg standard. The camera probably only recognizes it's own output. In fact the only difference is probably in the OS tags and just opening it may have modified some of the tags to something that the camera doesn't recognize so it doesn't even attempt to open the file. Derby Chang wrote: Sort of OT, but this puzzles me. My friend as a little Canon PS. She recently took a few pics that she wanted to print straight away. So she pulled the card out, opened a few of the pics from the card (knowing she shouldn't do this, but she was in a rush) in Photoshop, and printed them. Didn't save, and the Date/Time Modified of the files on the card are still the same as the Create Date. But sticking the card back into the Canon, she gets an Unrecognized file format error on just the JPGs she opened. We copied the files back onto her laptop, and the JPGs are fine. What's going on there? D -- I am personally a member of the Cream of the Illuminati. A union with the Bavarian Illuminati is contemplated. When it is complete the Bavarian Cream Illuminati will rule the world -- Anonymous -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
