I'm hoping for a little guidance on using the JPG Lossless Operation function to re-orient many of my images. I am using IrfanView 4.0 with Windows XP SP2.
I use the Thumbnail view to open the folder and view all the images. I select them all, then choose JPG Lossless Operations -> Lossless Transformation with Selected Files. The options selected are:
Auto-rotate according to EXIF Orientation
Optimize JPG file
Apply Original EXIF date/time to new file
Keep all APP markers (default)
After running the transformation, the images are now orientated properly, but I've noticed that the files sizes are now smaller. Does this mean that the images have in fact "lost" something (I assume as part of the JPG optimization) even though it is to be "lossless"?
If I restore the originals and the run it again, this time with the Optimize JPG option unchecked, the file sizes end up being larger after the transformation than they were before it.
What is the best way to re-orient large numbers of images without changing the original images themselves? Or by changing the EXIF orientation info, am I in fact changing the original?
Should the JPG Lossless Operations be changing the file sizes from what they were orginally?
What I am trying to do is to reorient the images properly, then run a batch conversion resize in order to get them in a size better suited for a website (800x600). (The original files are 2592x1944.) Perhaps there is a better way I should be going about this process?
Thanks.
Gary
I use the Thumbnail view to open the folder and view all the images. I select them all, then choose JPG Lossless Operations -> Lossless Transformation with Selected Files. The options selected are:
Auto-rotate according to EXIF Orientation
Optimize JPG file
Apply Original EXIF date/time to new file
Keep all APP markers (default)
After running the transformation, the images are now orientated properly, but I've noticed that the files sizes are now smaller. Does this mean that the images have in fact "lost" something (I assume as part of the JPG optimization) even though it is to be "lossless"?
If I restore the originals and the run it again, this time with the Optimize JPG option unchecked, the file sizes end up being larger after the transformation than they were before it.
What is the best way to re-orient large numbers of images without changing the original images themselves? Or by changing the EXIF orientation info, am I in fact changing the original?
Should the JPG Lossless Operations be changing the file sizes from what they were orginally?
What I am trying to do is to reorient the images properly, then run a batch conversion resize in order to get them in a size better suited for a website (800x600). (The original files are 2592x1944.) Perhaps there is a better way I should be going about this process?
Thanks.
Gary
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