Photos taken by others used to come in HEIC format. Now they come in JPG format with low resolution. I used to open the HEIC files with preeview, then export them to JPG and high resolution.
How do I get high resolution from compressed JPG files?
Example file from iPhone 13: 045CFE91-6B8A-4A6A-AFA3-40B82EB78F17_1_105_c.jpeg
The file size is 256kb.
iPhone SE, iOS 15
How are you receiving these photos? Via email or text?
You can't increase the resolution, i.e. uncompress, a 256 KB file. It is what it is. However, resolution is related to pixel dimensions. If the pixel dimensions are the same as the HEIC version the image resolution should be the same. It's explained in the article The Myth of DPI.
You'll have to contact the sender and have them send larger sized JPEGs or HEIC versions.
How are you receiving these photos? Via email or text?
You can't increase the resolution, i.e. uncompress, a 256 KB file. It is what it is. However, resolution is related to pixel dimensions. If the pixel dimensions are the same as the HEIC version the image resolution should be the same. It's explained in the article The Myth of DPI.
You'll have to contact the sender and have them send larger sized JPEGs or HEIC versions.
If you cannot get the sender to send you a high resolution image, the best you can do is to use some software that will enlarge the image without blurring the edges. For example the free online image enlarger (see: Online Image Enlarger) can interpolate pixels and increase the size, while keeping the edges sharp. I have used it successfully, when someone sent me tiny images.
if the images are highly compressed JPEGs you will notice the JPEG artefacts after enlarging the images . There is no help for that - JPEG is using a lossy compression. I used the retouch tool to get rid if the most annoying artefacts.
Old Toad sent an article discussing the myth of DPI. In it there was an explanation of PPI (Pixels per inch). I used Photoshop and selected "image size". The image size was 372 KB and the dimensions were 10x14 inches at 72 PPI. I changed the PPI to 300 and the dimension to approximately 5.25x7. The resulting file is now 2MB.
Look right to you?
I ran a test. I printed 2 8x10 photos one with the original 72 PPI and the second using the Photoshopped image at 300 PPI. The 300 PPI photo was much clearer. Thanks to everyone... especially Old Toads article "the myth of DPI". I'll look into ONLINE IMAGE Enlarger too. Others don't have Photoshop.
Maybe they have a flawed workflow that sends only tiny low-res thumbnails of the photos?
That doesn't change the quality of the image just the size that is printed. You can take a n image that is 2400 x 3000 pixels and at 300 dpi it will print at 8" x 10". However at 72 dpi it will print at 33" x 42"/. The [romted rest;itopm wo;; ge greater at the smaller print size but not the image file itself.
Hi,
Thanks for the reply!
I’ll try that. Thanks.
Unpack JPG Files
