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It sounds like you're trying to use JPG files as reference images on your camera's SD card, but they're not showing up in the camera's gallery. Here are some possible reasons and solutions:
1. File Format or Resolution Compatibility
Some cameras have specific requirements for the resolution, aspect ratio, or file format of images that can be displayed in their gallery. Ensure the JPGs are saved in a resolution and aspect ratio supported by your camera (e.g., 4:3 or 3:2, depending on your camera's sensor).
If the JPGs are saved in an unsupported format or resolution, the camera might not recognize them. Try resizing the images to match your camera's native resolution.
2. File Naming or Folder Structure
Cameras often expect images to be in specific folders (e.g., DCIM/100CANON or similar, depending on the brand). If you're placing the JPGs in a custom folder or the root directory, the camera might not recognize them.
Copy the JPGs into the same folder where your camera stores its own photos (usually inside the DCIM folder).
3. Corrupted or Unsupported Metadata
If the JPGs have unusual metadata or are saved with non-standard settings, the camera might not be able to read them. Try opening the JPGs in an image editor (like Photoshop or GIMP) and re-saving them with standard settings.
4. SD Card Formatting
Ensure the SD card is formatted correctly (usually FAT32 or exFAT, depending on the camera). If the card isn't formatted properly, the camera might not read the files.
Format the SD card in your camera (not on your computer) to ensure compatibility.
5. Camera Firmware Limitations
Some older cameras might have limitations on the types of JPGs they can display. Check your camera's manual or firmware updates to see if there are any known issues.
6. Hidden Files or Thumbnails
If the JPGs are accompanied by hidden files (like .thumbs or .DS_Store files), the camera might get confused. Remove any non-JPG files from the SD card.
