dpi on raw vs jpeg
Oct 6, 2019 21:33:17 #
Hi. I'm new to the group and hope I can ask my question so that you understand what I'm saying. I have a new Nikon D500 - and I noticed when I download the raw and jpeg photos to the computer, the raw show only 72DPI and the jpeg are 300 DPI. I have both set to capture large pixel size and the jpeg in large/fine.
When I open them in lR or PS - the raw change to 240 dpi and the jpeg remain at 300 dpi. Can I do something to change my raw to 300 dpi? I like to make prints in either 11X14 or 16 X 20. I'll attempt to attach a raw and jpeg unprocessed so you can see what I mean. The one shown is the jpeg. The attached file download is the raw.
When I open them in lR or PS - the raw change to 240 dpi and the jpeg remain at 300 dpi. Can I do something to change my raw to 300 dpi? I like to make prints in either 11X14 or 16 X 20. I'll attempt to attach a raw and jpeg unprocessed so you can see what I mean. The one shown is the jpeg. The attached file download is the raw.
Oct 6, 2019 21:45:02 #
How are you getting the photos from the camera to the computer? Could you be seeing the small jpeg thumbnail in the raw file? How many actual pixels are the images width by height?
Oct 6, 2019 21:57:28 #
RAW is NOT an image format, repeat, NOT an image format. The image you see from the RAW data file is a tiny embedded JPEG, a thumbnail. You must process the RAW data first to create an image file like TIFF or JPEG.
Oct 6, 2019 22:00:38 #
Oct 6, 2019 22:04:09 #
that makes sense - I didn't understand that it wasn't an image format - thanks
Oct 6, 2019 22:07:10 #
Ignore the DPI (which is a printing/scanning term) and concentrate on the size of the image in pixels.
Oct 6, 2019 22:21:22 #
Don't know if I can be of any help here, but here goes:
I upload from my D500 using Nikon software. Any post work
is saved as a TIFF file.
I have made acceptable 12"x18" prints (at least to me ) from as
little as 15% of the original using the finished TIFF With a Canon PRO-100
using the Canon software, usually with Red River Paper.
Hope this helps.
I upload from my D500 using Nikon software. Any post work
is saved as a TIFF file.
I have made acceptable 12"x18" prints (at least to me ) from as
little as 15% of the original using the finished TIFF With a Canon PRO-100
using the Canon software, usually with Red River Paper.
Hope this helps.
Oct 6, 2019 22:36:00 #
Ruraldi wrote:
Hi. I'm new to the group and hope I can ask my que... (show quote)
It's PPI. DPI is printing density/resolution. I know, Adobe lists everything arbitrarily. IR? If you open your files with Ps or Lr you set PPI (to say 300ppi) with Adobe Camera Raw and Ps and Lr for bit depth; your camera likely produces 14-bit Raw and you can set that in your PP software to 16-bit or 8-bit or 32-bit Raw or 8-bit JPG. 16-bit is typical for most PP programs and most Tools.
Oct 6, 2019 22:45:04 #
larryepage
Loc: North Texas area
I suggest that you simply do your own experiment and make a print from one of your Fine/Large JPEG files and a print from the corresponding raw file. Personally, I am a big fan of TIFF files, but I suggest using one of the Adobe file formats for this test. Export is not necessarily always a straightforward conversion. Sometimes other things happen during that process. I've experienced a couple of cases where really weird things happened when using the Export function...insertion of artifacts into low key areas of the file and other issues. Examine the two prints against each other to evaluate the resolution of each image and the dimensional size of each image.
There is so much misunderstanding on this forum of just exactly what these files are and how they are managed and manipulated by the software that you are likely to become very non-constructively confused by the discussion that is sure to follow. So experiment and convince yourself how the two file types really are the same and how they are different in ways that may make a difference.
There is so much misunderstanding on this forum of just exactly what these files are and how they are managed and manipulated by the software that you are likely to become very non-constructively confused by the discussion that is sure to follow. So experiment and convince yourself how the two file types really are the same and how they are different in ways that may make a difference.
Oct 7, 2019 00:28:08 #
Use the pixel resolution of your image to determine the possible print sizes
Simply calculate the necessary pixels to print your image at the 'gold standard' 300 pixels per inch (PPI). Your PPI is something you have to calculate, not a magic number in the camera or file settings. If you don't crop your original 5,568-pixel × 3,712-pixel image (20.9MP) from your D500, your PPI options are:
Example print sizes at different PPIs of 20.9MP image
300 PPI - 18in x 12in
250 PPI - 22in x 14in
200 PPI - 27in x 18in
As shown above, your target print size is calculated by Image-Pixel-Size / PPI = Print-Size such as 5568px / 300ppi = 18.6in.
This 300ppi 'gold standard' is flexible as you get into larger and larger sizes and the viewing distance comes into play and a lower PPI makes no visual difference, unless you want to stand nose to picture. You can see how ultra-high megapixel sensors like the 50MP EOS 5Ds (8688 × 5792px) can yield larger and larger prints at 300PPI, and then still even larger prints at 250ppi or 200ppi.
What about DPI?
Whether you display your digital images on a screen or print them to a physical size, you only need to understand the pixel resolution of the image as compared to the target size. DPI has no impact on your print size from your DSLR. Your screens are measured in pixels just like your image files. In a digital image, DPI is as useful as your appendix, a vestige of another time in our development.
This link discusses the pixel resolution idea when looking at the viewing size of a digital image on your computer monitor or similar HD TV: Recommended resizing parameters for digital images
Simply calculate the necessary pixels to print your image at the 'gold standard' 300 pixels per inch (PPI). Your PPI is something you have to calculate, not a magic number in the camera or file settings. If you don't crop your original 5,568-pixel × 3,712-pixel image (20.9MP) from your D500, your PPI options are:
Example print sizes at different PPIs of 20.9MP image
300 PPI - 18in x 12in
250 PPI - 22in x 14in
200 PPI - 27in x 18in
As shown above, your target print size is calculated by Image-Pixel-Size / PPI = Print-Size such as 5568px / 300ppi = 18.6in.
This 300ppi 'gold standard' is flexible as you get into larger and larger sizes and the viewing distance comes into play and a lower PPI makes no visual difference, unless you want to stand nose to picture. You can see how ultra-high megapixel sensors like the 50MP EOS 5Ds (8688 × 5792px) can yield larger and larger prints at 300PPI, and then still even larger prints at 250ppi or 200ppi.
What about DPI?
Whether you display your digital images on a screen or print them to a physical size, you only need to understand the pixel resolution of the image as compared to the target size. DPI has no impact on your print size from your DSLR. Your screens are measured in pixels just like your image files. In a digital image, DPI is as useful as your appendix, a vestige of another time in our development.
This link discusses the pixel resolution idea when looking at the viewing size of a digital image on your computer monitor or similar HD TV: Recommended resizing parameters for digital images
Oct 7, 2019 03:31:13 #
Ruraldi wrote:
that makes sense - I didn't understand that it wasn't an image format - thanks
You're quite welcome. There are a lot of people who don't know that and don't realize the image they see from the RAW data file is a JPEG thumbnail. That thumbnail is there so you can see the image without having to process the data. What the final image will actually look like depends on the parameters used when processing the RAW data into an image format.
Oct 7, 2019 12:18:00 #
Ruraldi wrote:
Hi. I'm new to the group and hope I can ask my que... (show quote)
Why are you worried about this? DPI as reported by many photo editing programs is just a number that does not impact the resolution of the image. You can change the dpi value from 2 to 2000, and it won't make a bit of difference in the size, appearance or quality of your image.
When you print you are going to need to watch your PPI (pixels per inch) which WILL have an impact on print quality. There is no such thing as a standard though some ascribe to 300 ppi - which is completely appropriate for prints viewed at close distances - as in a book, magazine or a small print. Similarly, the gold standard for billboards is around 30 ppi or less. The viewing distance will determine the extent to which the human eye can discern small details - and that ability diminishes with distance.
This website explains what you need for resolution for different sized prints, and how viewing distance is taken into consideration.
http://www.photokaboom.com/photography/learn/printing/resolution/1_which_resolution_print_size_viewing_distance.htm
It has all the standards you can come up with - and a few others as well.
The pixel count is relevant. The dpi listed in the EXIF data is not.
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