EXIF puzzle

Someone recently sent me an email with some JPEG images attached, I would like to use one, with their permission, in a website, but the attached images are too small. The exif says that they were taken with a Nikon D3400, so I assumed that the sender had kindly reduced them to a sensible size (213x320 px) to go as email attachments. I asked the photographer to use a file transfer program to send me the full Nikon jpeg for me to reduce to a suitable but larger size.

The photographer now tells me that they were taken on an ipad, not a Nikon, and that 213x320 is the full size. How come that my PSE and Windows 7 Photoviewer file-info options both report that they were taken on a Nikon D3400?

Is it possible that the iPad was loaded with Nikon Image Space for photo editing?

Can't you just double the pixel size to 426 x 640 or to whatever you want in almost any photo editing software ? It really doesn't matter what they were taken on to resize them.

Dunno... I have never used an iPad. I'll ask the person who sent me the images - if they are technically aware!

Yes, naturally I could double the size, but that would not improve resolution of detail compared to sizing down a full dslr file. It would just spread one pixel over two spaces.

Even on an ipad 426x640 is really small. Even my 3 1/2 year old phone manages 3968 x 2976.

You can increase resolution a bit in PS or whatever, but it won't invent detail where there isn't any. The best way is to do it in tiny steps rather than one big leap.

I wonder if the person saved the picture off the web on their ipad hence the low resolution and the dodgy EXIF data? Call me suspicious but....

K.

What exactly is "Nikon Image Space" other than a website ?

Do you really want to know?
https://www.nikonimagespace.com/lang/en/

Doubt you'll be any the wiser though!

Thanks John. I thought it referred to a type of colour-space

I guess it is possible the exif is simply being misread by the exif reader, or that the data in the exif was changed either manually or by some editing software.

Try doing an image search on the web... there are various tools out there for that.

Is the sender of the original image absolutely sure that this is the original size of the JPEG? Or are they assuming that it is because they haven't themselves done anything to resize it? E-mail can sometimes reduce the size of a JPEG, it depends on what e-mail software Is used and what options are sets (it's done by default to keep the total message size to a minimum). I've had this problem when family members send photos direct from phone and the photo is embedded in the e-mail.

Steve

I agree; a jpeg of only 213x320 px would be weird for an iPad. I see that the spec for the current 10.2 includes a 8 Mpx camera. As for your suspicions, I have none. The photograph was of an old unregarded bit of street furniture in a dismal backstreet, only now recognised by the photographer as having historical significance. They have promised to go back and photgraph it again with a 'proper' camera.

How on earth the iPad files came to have a Nikon-attributed EXIF still puzzles me. The file info on PSE even states that the lens was a Tamron AF 18-270 f/3.5-6.3 Di II which is clearly a nonsense. I don't know how EXIF data is stored in a jpeg file - ie the binary algorithm etc. I hoped that one of you knowledgeable experts might know!