topic Re: canon rf 72 dpi to 300 settings in EOS DSLR & Mirrorless Cameras

EOS Rebel T8i settings to change 72 dpi to 300 dpi

googlepoint — Tue, 11 Jun 2024 13:16:35 GMT

please tell me how to set my camera satting 72dpi to 300dpi

Re: canon rf 72 dpi to 300 settings

AtticusLake — Wed, 25 Jan 2023 08:57:46 GMT

I suspect there's something going on here that you don't understand. Your camera doesn't have a DPI setting. I can't find anything called "DPI" in photos taken by my camera (R5). Even if it was there, and if the camera set it to 72, it would make no difference because it would just be ignored.

When you print a picture, you decide whether you want it to fill the page, or take up some space on a page, or whatever. This determines the DPI it will be printed at. So if you're not getting the results you expect, I suggest you look at how you're doing your page setup. There's nothing in the camera that can affect it. The images the camera takes just have however many pixels; how those pixels get mapped to inches is all about your page setup when you print.

Of couse if you're just looking at images on a screen, then DPI is even less relevant, because the screen can be whatever size.

You can set the image quality your camera takes, which determines the number of pixels in the image -- you'll find this in the menus. I always set it to the max, because there's just no reason not to. I would tell you where to find this in your camera's manual, but you didn't mention what camera you have.

Re: canon rf 72 dpi to 300 settings

BrianDavies — Wed, 25 Jan 2023 11:45:06 GMT

What are you trying to achieve? If you open your image in a browser or on a phone etc., it will open based on how many pixels there are in the image and how many pixels make up your monitor. So let's say your image is 1920px by 1080px, it will completely fill a 1080p screen, but will take up 1/4 of a 4K (3840px x 2160px) screen.

You can assign a PPI (pixels per inch) value to tell your printer how large to print your image. If you want to print a 6" x 4" photo and you want 300ppi to get optimum print quality on a particular device, then you can resize your image to 1800px x 1200px at 300ppi in Photoshop, Affinity Photo etc. If you inadvertently set it to 1800px x 1200px at 150ppi then you would be telling your printer to print the image at 12" x 8" (12x150 = 1800px, 8x150=1200px).

DPP has a field in the Preferences to set images exported from DPP at any PPI you like (see image below). I think it defaults to 240ppi, but you can change it. This won't really achieve anything and would mean you are missing out on the superior features of LR or CaptureOne Pro etc.

Re: canon rf 72 dpi to 300 settings

rs-eos — Wed, 25 Jan 2023 13:24:44 GMT

Adding a bit more to the already-excellent answers provided earlier. Perhaps this will add additional clarity.

Any DPI value as stored in any metadata in images are just hints. It could be that cameras are filling in that metadata value to be 240 or whatever other value.

Think of DPI as speed (e.g. MPH or km/h) in that it doesn't tell the entire story. If I told that you I drove 60 MPH, you wouldn't know either how far I drove (distance) or how long I was driving for (time). At least one of those values (distance or time) would be required.

Similarly, if you have a DPI value of 300, you need at least one other value (either pixels of the image or physical size you want the image to be).

Example: If your goal is to generate an 8 x 10 inch print with exactly 300 DPI, this would mean you need your image to be 2400 x 3000 pixels.

Re: canon rf 72 dpi to 300 settings

BrianDavies — Wed, 25 Jan 2023 14:13:03 GMT

Great explanation and very clear too!

Re: Settings to change 72 dpi to 300 dpi

ebiggs1 — Wed, 25 Jan 2023 14:47:49 GMT

"please tell me how to set my camera satting 72dpi to 300dpi"

Here's the real scoop on digital cameras. All cameras capture images at full resolution. This is in the form of a Raw file. Simply ones and zeros. The size or quality of the photo is done when you save it. For instance if you select large jpeg your camera deletes image info that it deems less important. Choosing smaller jpeg formats increases the amount of info that gets trashed. If as I assume form you question, you want the highest or best IQ you need to be using large Raw file. This is all the resolution that is available of course it is a much larger file.

Once you have the photo ready for printing in your editing software, like DPP4, you can set the DPI to 300 or wherever you choose. The 72 DPI you see in the exif file info is merely a place holder and is meaningless.

Re: canon rf 72 dpi to 300 settings

johnrmoyer — Thu, 26 Jan 2023 14:05:51 GMT

In ancient times, a pair of resolution numbers in an image were used as hints for printing or display. I would guess that they are never used now. I expect these resolution number are a left over from ancient times. Then, computers were not fast enough and algorithms were not good enough to scale an image and some thought that an image should be displayed at the original size that it had on paper. It was also sometimes helpful to set the resolution numbers to the actual printer resolution to keep the printer from doing a bad job of scaling the image using a poor quality algorithm built into the printer.

My camera puts the resolution into the meta data as 72 for both CR3 file and JPG file, but if I edit the image in DPP, the resolution is changed to 350 when I save a JPG file.

exiftool will display these numbers

exiftool -s -G0:2 -resolutionunit -xresolution -yresolution /Volumes/jrm/photos/2023Jan16/IMG_2403.JPG
[EXIF:Image] ResolutionUnit : inches
[EXIF:Image] XResolution : 72
[EXIF:Image] YResolution : 72

exiftool might also be used to change these numbers in case some printer or display actually uses them.

Re: canon rf 72 dpi to 300 settings

rs-eos — Thu, 26 Jan 2023 19:17:06 GMT

DPI in metadata is still useful to me as sometimes I will adjust those values in screenshots or other graphics documents I produce on my Mac. By default, all screenshots I capture are set to 144 DPI since I'm using a 5K retina display (each point is backed by four pixels). Similarly, when writing software with bitmap-based images, I'll specify different files tagged with relevant DPI values. That way, when I share to others that would have different displays, or ship the software to be used on Macs or devices with different screen types, all works out well.

Re: Settings to change 72 dpi to 300 dpi

Mercedes1 — Tue, 11 Jun 2024 03:53:43 GMT

I am grateful that you simplified this for me! I am left with a question.... I only now have started to take photos in RAW and I have several that are JPEG and the resolution is 72 dpi. They were saved as 6000 x 4000 (large). So, If I am understanding correctly, before uploading to print, simply set the dpi to 300 or 350 for a better print? I have a canon rebel t8i. I honestly had not noticed till today that this was happening!

Re: Settings to change 72 dpi to 300 dpi

johnrmoyer — Tue, 11 Jun 2024 10:27:55 GMT

@Mercedes1 wrote:

I am grateful that you simplified this for me! I am left with a question.... I only now have started to take photos in RAW and I have several that are JPEG and the resolution is 72 dpi. They were saved as 6000 x 4000 (large). So, If I am understanding correctly, before uploading to print, simply set the dpi to 300 or 350 for a better print? I have a canon rebel t8i. I honestly had not noticed till today that this was happening!

In ancient times, the 72 dpi would be used by software to resize an image for display on a screen or for printing. It is still used in PDF files, so far as I can remember. Changing the DPI usually does not change the image itself and it is usually safe to ignore the DPI number.

If the print service you are using pays attention to the DPI, then you could use the Canon DPP software to set the DPI in the JPG to what ever the print service requires. The print service I have used ignores the DPI number.

Re: Settings to change 72 dpi to 300 dpi

BrianDavies — Tue, 11 Jun 2024 11:06:19 GMT

To get optimum printing results, assuming you are using a printer which gives best results at 300ppi - resize the image to the correct dimensions at 300ppi. So if you want a 12" x 8" print at 300ppi, set the image resize dialog to show either 12" x 8" at 300ppi or 3600px x 2400px at 300ppi, both mean the same thing.

Some graphic design software like CorelDraw use this metadata to know what size you wish an imported/placed image to appear at on the page. If you had a 12" x 8" magazine and imported an image set at the above dimensions/resolution, the image would automatically fill the page. The page itself has a default resolution and would usually be 300ppi.

Re: Settings to change 72 dpi to 300 dpi

BrianDavies — Tue, 11 Jun 2024 11:07:53 GMT

DPI/PPI is still very real and used in the graphic design/print industry.

Re: EOS Rebel T8i settings to change 72 dpi to 300 dpi

ebiggs1 — Tue, 11 Jun 2024 15:06:41 GMT

"DPI/PPI is still very real and used in the graphic design/print industry." and "To get optimum printing results, ..."

Have nothing to do with the OP query, "please tell me how to set my camera satting 72dpi to 300dpi"

Re: canon rf 72 dpi to 300 settings

Mercedes1 — Wed, 19 Jun 2024 17:11:37 GMT

the image you are showing for DPP is for the DPI of the photo and not the PPI. DPI is for the printer, and it describes how tightly the little dots of ink are sprayed on the paper to create the photograph. Thus, I am a bit confused on how you are using the term PPI

Re: canon rf 72 dpi to 300 settings

ebiggs1 — Wed, 19 Jun 2024 17:18:11 GMT

DPI and PPI get confused by a lot of people.

Re: canon rf 72 dpi to 300 settings

Mercedes1 — Wed, 19 Jun 2024 17:18:31 GMT