After transfering my photos from my digital camera to my PC, I could see details of my camera and some specific details concerning the photo(JPEG) when I right-clicked a photo & select properties.
However, when I opened that folder in XnView and used "multi-convert" to resize those photos & saved to new files(same format), all the details are lost. Is there any way that I can preserve those details after doing "multi-convert"?
P.S. I'm using XnView 1.14 on Windows XP
Thanks in advance.
Details lost when Resizing and Saving Photos
Moderators: helmut, XnTriq, xnview
Jerry, my reply got a bit lengthy, but I think the extra info is interesting for you and other readers.
When resizing images, there are two transformations where image information (quality) can be lost:
a.) The resizing process
b.) The saving of the image
a.) Loosing quality when resizing an image
When resizing images (here: make them smaller), the resize algorithm is important and decides on the quality of the image resized. Currently, XnView has only comparatively simple resize algorithms and the results have not professional quality, but for most purposes it's sufficient. There will be "Bicubic" and other interpolation algortihms in the next release of XnView.
But I think the resizing is not your problem: Once you've resized an image please check whether details are lost, already. I think not. So read on...
b.) Loosing quality when saving an image
This might be surprising: When saving an image you can loose quality. The reason is the data compression applied when saving.
At first, when data compression and image compression was invented and introduced, the compression algorithms compressed the image lossless: When compressing the data (image) and then decompressing the result was 100% identical. Most image formats are lossless, the most popular are GIF and TIFF.
With images and movies the amounts of data got very large and new compressions algorithms like JPG were invented that are "lossy". That means when compressing the image, the algorithm does some changes to the images and optimizes it so that it can be compressed more than you could with any lossless compression.
In most cases, you do not notice the difference, but it is there: On the web you might have seen images with text and the text was sort of sharp but had some "dirt" around it. This is one possible result of the image compression (call "artefacts").
The lossy image compression bases on mathematical functions and by changing the parameters of the compression algorithm the result will vary a lot. Often, the (graphic) software allows to change these parameters and you can influence the result (data size, quality, result).
The problem
Now with all this background info we can tackle your problem: I assume that you use the JPG format and suspect the image compression applied when saving to be your problem. First resize your image and make sure that the details are still there.
When saving your image, press the buttons "Options" on the save dialog. The Option dialog is opened and directly get to the page with the options for the image format you have currently chosen in the save dialog. There you can see the JPG options and set them. Currently, you are not happy with the quality, so try setting the sliders to a higher quality and then save the image.
The post Smaller image has same file size has also some useful infos on the JPG format.
Hope this explanation helps.
PS: I strongly recommend you to upgrade to the current version of XnView. XnView 1.14 was released in April 2000 and is not quite up-to-date.
When resizing images, there are two transformations where image information (quality) can be lost:
a.) The resizing process
b.) The saving of the image
a.) Loosing quality when resizing an image
When resizing images (here: make them smaller), the resize algorithm is important and decides on the quality of the image resized. Currently, XnView has only comparatively simple resize algorithms and the results have not professional quality, but for most purposes it's sufficient. There will be "Bicubic" and other interpolation algortihms in the next release of XnView.
But I think the resizing is not your problem: Once you've resized an image please check whether details are lost, already. I think not. So read on...
b.) Loosing quality when saving an image
This might be surprising: When saving an image you can loose quality. The reason is the data compression applied when saving.
At first, when data compression and image compression was invented and introduced, the compression algorithms compressed the image lossless: When compressing the data (image) and then decompressing the result was 100% identical. Most image formats are lossless, the most popular are GIF and TIFF.
With images and movies the amounts of data got very large and new compressions algorithms like JPG were invented that are "lossy". That means when compressing the image, the algorithm does some changes to the images and optimizes it so that it can be compressed more than you could with any lossless compression.
In most cases, you do not notice the difference, but it is there: On the web you might have seen images with text and the text was sort of sharp but had some "dirt" around it. This is one possible result of the image compression (call "artefacts").
The lossy image compression bases on mathematical functions and by changing the parameters of the compression algorithm the result will vary a lot. Often, the (graphic) software allows to change these parameters and you can influence the result (data size, quality, result).
The problem
Now with all this background info we can tackle your problem: I assume that you use the JPG format and suspect the image compression applied when saving to be your problem. First resize your image and make sure that the details are still there.
When saving your image, press the buttons "Options" on the save dialog. The Option dialog is opened and directly get to the page with the options for the image format you have currently chosen in the save dialog. There you can see the JPG options and set them. Currently, you are not happy with the quality, so try setting the sliders to a higher quality and then save the image.
The post Smaller image has same file size has also some useful infos on the JPG format.
Hope this explanation helps.
PS: I strongly recommend you to upgrade to the current version of XnView. XnView 1.14 was released in April 2000 and is not quite up-to-date.
-
Jerry McMorran
Thanks for your detailed reply and I've followed your advice to try the newest version and it works!
Actually, maybe my question is not clear enough...
What I mean "details" here is regarding to those "information" embedded into the JPEG file by the camera. After using the new version of XnView, now I know that kind of information is called "EXIF data".
Anyway, sorry for misleading you...
Actually, maybe my question is not clear enough...
What I mean "details" here is regarding to those "information" embedded into the JPEG file by the camera. After using the new version of XnView, now I know that kind of information is called "EXIF data".
Anyway, sorry for misleading you...
Good that the new XnView version could solve your problem.Jerry McMorran wrote:...After using the new version of XnView, now I know that kind of information is called "EXIF data"....
Was my fault - the first time I didn't read your request thorougly. But I'm quite sure that someone will pose the question to my answer one day.Jerry McMorran wrote:...Anyway, sorry for misleading you...
