Camera Refuses to Display Identification jpeg ???

Now that I have things thoroughly confused, I will try to explain my situation.

Canon 7DMkII

I made a jpeg image file that says "This Camera Belongs To: " along with my name and contact information.
I numbered this image 7D2_0001 so that it should display first in line should someone find the camera and check the images.
I don't remember just why this image turned out to have these pixel dimensions - 3684 wide by 2736 tall
A straight out of the camera jpeg measures 5472 wide by 3648 tall.
I put it in the image folder on the SD card.
The camera must know that the image is there, as it gives the notice "Cannot Display this image"
What did I do wrong ?

I am thinking maybe load a jpeg straight from the camera into PS Elements, fill the layer with a solid color, then drag my identification image on top of that, flatten layers and save as jpeg, in hopes of fooling the camera into recognizing the jpeg.

Thanks for reading and all help is appreciated.

Okay --- I snapped a picture with the camera.
I dragged my contact information image on top of the camera image and flattened layers.
Renamed to 7D2_0001.
Still no go; displays "Cannot Playback Image"

With the camera jpeg as bottom layer, all EXIF and such of the original image remains with the new image.

I cannot understand why this will not work.

It has always worked in other cameras.

Okay--- I did the same and LEFT THE NUMBER the SAME = still no go.
Way back when we didn't know any better, the wife would have images from several different cameras of various brands on a card and the camera would display them so long as they were a jpeg.

Am I just going to have to take a picture of a poster with the information written on it ?

Check this https://support.usa.ca​non.com …09384&cat=5169B​&actp=LIST

Why not just take a picture of a piece of paper with the information, then leave it alone (no PP)? Kind of like the old 35mm technique when film had to be mailed to Kodak. I carried a handkerchief with name & address; it was always first shot taken on a roll. Actually worked well once, some film was lost and Kodak was able to find it based on the info on frame 1.

'Since forever' the Canon camera has not had the ability to show on its rear LCD any image file that was not placed on the memery card by the camera itself. Even an externally post processed file which originated from the Canon camera will not be displayed. Back when I had a Canon G2 (c. 2002) as my first digital camera, I discovered this and verified the limitation via Canon Support.

(Not confirmed by Canon: ) Apparently the camera writes an entry on the card somewhere, in addtion to writing the RAW or JPG image file, and the lack of this entry is what prevents the camera from seeing the presence of the file.

John from PA wrote in post #19055515
Why not just take a picture of a piece of paper with the information, then leave it alone (no PP)? Kind of like the old 35mm technique when film had to be mailed to Kodak. I carried a handkerchief with name & address; it was always first shot taken on a roll. Actually worked well once, some film was lost and Kodak was able to find it based on the info on frame 1.

Wilt wrote in post #19055523
'Since forever' the Canon camera has not had the ability to show on its rear LCD any image file that was not placed on the memery card by the camera itself. Even an externally post processed file which originated from the Canon camera will not be displayed. Back when I had a Canon G2 (c. 2002) as my first digital camera, I discovered this and verified the limitation via Canon Support.

(Not confirmed by Canon: ) Apparently the camera writes an entry on the card somewhere, in addtion to writing the RAW or JPG image file, and the lack of this entry is what prevents the camera from seeing the presence of the file.

Thanks for the information.
I guess I will just try to write the info on a paper and snap a shot of that.
It would probably be best if I had the wife do the writing as I can't read everything I write myself.
I appreciate you guys heading me off from spending another several hours trying to get this to work.

Wilt wrote in post #19055523
.
'Since forever' the Canon camera has not had the ability to show on its rear LCD any image file that was not placed on the memery card by the camera itself. Even an externally post processed file which originated from the Canon camera will not be displayed. Back when I had a Canon G2 (c. 2002) as my first digital camera, I discovered this and verified the limitation via Canon Support.

Apparently the camera writes an entry on the card somewhere, in addtion to writing the RAW or JPG image file, and the lack of this entry is what prevents the camera from seeing the presence of the file.
.

.
Then how come for years and years, I have been able to take photos with a Canon DLSR, take the card out, put it into another Canon DSLR, and see the photos on the other Canon's rear LCD?

This has always worked interchangeably with a Canon 50D, 1D2, 1D4, 5D(c), 5D2, 7D, 6D, 40D, and 5D4. . Take photos on any of these cameras, take the card out, put it into another one of these cameras,* and see the images on the rear LCD.

If what you have said was true this wouldn't be possible.


*with the same type of memory card slot

.

Tom Reichner wrote in post #19055579
.
Then how come for years and years, I have been able to take photos with a Canon DLSR, take the card out, put it into another Canon DSLR, and see the photos on the other Canon's rear LCD?

This has always worked interchangeably with a Canon 50D, 1D2, 1D4, 5D(c), 5D2, 7D, 6D, 40D, and 5D4. . Take photos on any of these cameras, take the card out, put it into another one of these cameras,* and see the images on the rear LCD.

If what you have said was true this wouldn't be possible.

*with the same type of memory card slot

.

Because Canon Camera B writes similar 'hidden' file content onto the memory card as does Canon Camera A!
Since Canon has had no need to alter the overall concept which is followed by all its cameras, there is no 'version incompatability' between the camera of 2020 as the camera of 2002...not to say that in the future it does not change so that the camera of 2002 can no longer detect photos written to its memory card by the camera of 2030.

Wilt wrote in post #19055523
'Since forever' the Canon camera has not had the ability to show on its rear LCD any image file that was not placed on the memery card by the camera itself. Even an externally post processed file which originated from the Canon camera will not be displayed. Back when I had a Canon G2 (c. 2002) as my first digital camera, I discovered this and verified the limitation via Canon Support.

(Not confirmed by Canon: ) Apparently the camera writes an entry on the card somewhere, in addtion to writing the RAW or JPG image file, and the lack of this entry is what prevents the camera from seeing the presence of the file.

Although I generally agree, I’m somewhat like Tom in that I can site a similar instance of the camera being able to read the card, albeit a video. When I bought my 60D, there were about 10 videos (Canon called them tutorials) that were available. You could download them to a PC, place them on an SD card, and then watch/listen to them on the camera. I used to review them prior to vacation.

BuckSkin wrote in post #19055564
Thanks for the information.
I guess I will just try to write the info on a paper and snap a shot of that.
It would probably be best if I had the wife do the writing as I can't read everything I write myself.

Printer????

Thanks guys; I got it worked out.

Once in a while my brain takes ahold ---

I already had my nice bold contrasty contact information jpeg all signed, sealed, and delivered.

I just displayed it full-screen on my 21.5" monitor, turned off the overhead lights so as to eliminate them reflecting in the screen, and snapped a few shots until I got it like I wanted it.

I did this for both cards.

I removed the cards and put them in the reader.

I chose the best image on each card and deleted the rest.

I renumbered the keepers 0001 on one card and 0002 on the other, reason being that I noticed the numbering continued consecutively from one card to the other and I was not sure how it would handle having a 0001 on both cards.

I put the cards back in the camera and now they display as I wanted.

One big advantage to doing it this way is that I also get a matching RAW so that I don't always have that one odd jpeg misaligning things when I go to batch select either the RAWS or the jpegs.

I also put a text file in the "root" of the cards with all my information and named that file "This camera belongs to etc., etc."; thus, the file need not be opened to get the idea across.

John from PA wrote in post #19055605
Although I generally agree, I’m somewhat like Tom in that I can site a similar instance of the camera being able to read the card, albeit a video. When I bought my 60D, there were about 10 videos (Canon called them tutorials) that were available. You could download them to a PC, place them on an SD card, and then watch/listen to them on the camera. I used to review them prior to vacation.

Video files might use a very different indexing system on a memory card than what the Canon cameras do for indexing RAW/JPG files on the same card

BuckSkin wrote in post #19055611
One big advantage to doing it this way is that I also get a matching RAW so that I don't always have that one odd jpeg misaligning things when I go to batch select either the RAWS or the jpegs.

I also put a text file in the "root" of the cards with all my information and named that file "This camera belongs to etc., etc."; thus, the file need not be opened to get the idea across.

Every advantage has a disadvantage; don’t format that card!

Formatting is important...

The card is a storage device, just like a disk is a storage device for a computer. There is a "file system" that Canon has designed for managing that storage device. The file system includes a directory of files on the storage device and (separately) the files (i.e., pictures) that correspond to those directory entries.

The disadvantage of not formatting the card (with some degree of regularity) is that as you delete pictures, you leave gaps in the directory structure. When you take a new picture, the camera searches the directory for an empty slot and populates it with information about the new file (i.e., picture). In theory, this all works fine.

Per rumor or errant speculation, having gaps or messy directories, the camera can be slowed or encounter errors when writing files and finding open directory slots and updating the directory when trying to do everything quickly. Also in theory, the operating system for the camera is software and software has bugs. Personally, I've never experienced any such bug.

However, if you have multiple cameras and move your cards between cameras, then you could have a situation where the version of the operating system (and how it manages the file system) could be out of sync with the version of the operating system on another camera. The analogy is having two computers with different updates (fairly common).

Therefore, (and not rumor,) while I wouldn't worry as much about formatting the card that stays in the same camera, I do format (pretty regularly). I have a set of cards that can end up in any camera body on a given day. Insert card? Format it.

With a regular habit of formatting, having the permanent image #1 wouldn't work for me.

However...

At any time, my cards are either: in a camera, in the (hardened) carrying case or on my desk waiting to get loaded into Lightroom. I (used to) put my contact info on each camera and the carrying case. If someone is going to steal the card (or camera, or lenses) then the info won't matter anyway. But if someone is willing to return the card, then the camera will be wrapped around it. I also have my contact info on business cards that are in a few different places in my bag.

I wanted to check and make sure before I put my foot in my mouth.
I just now have investigated and our fleet of Canon pocket cameras are not so particular about this Canon image by camera only business.
My Photoshop Elements created identification jpegs are displayed first-in-line the same as if they had been taken by the camera.
This includes an S90, several SD880s, a couple SD870s, and a SD1200; with these Canon cameras, I can create my identification jpegs in computer, load them in the card, and the camera does not hesitate to display them.

I know that this will not slow down a professional thief; but, I have not met a professional thief in my whole long life; what we do have plenty of around here are empty-skulled meth-heads with no more sense than to take something with someone's name emblazoned boldly on all sides to the pawn shop and expect to get a few bucks.
As long as they don't just out of plain stupidity lose it or otherwise damage it before they get to the pawn shop, you have a better than average chance of getting your stuff back.

I have an electric engraving tool, a wood-burning tool, routers, welders, and permanent white-out pens, and just about everything I own has written on it, both in plain view and in several hidden locations, "STOLEN FROM __MY NAME__"
If it is big enough steel, it is burned on with a welder, or center-punch-dotted, or the letters made out with a series of holes drilled through.
Smaller stuff gets engraved.
Wood and leather gets the wood-burner.
I have a registered fire-brand and all of our saddles, saddle bags, rifle boots, etc. carry that brand, plus the horses and cattle.

Most half-way honest people, if they can find some contact information, will try to see stuff returned to the rightful owners.
Of course this can backfire on you when your prize Blue Tick coon hound with your contact information on the collar tears into someone's registered Rhode Island Reds; if you have ever seen a dog in a big pen full of chickens then you will know what I mean; you can't get in there and get ahold of him before he has killed a hundred or so.

I will say this, and I stand by it, if someone is careless enough to lose a billfold or big wad of cash, they don't deserve to get it back; if they do get it returned, it won't be a week before they lose something else. I may lose mine tomorrow; and, if I do, then it is my own fault.