image size

[azzam33334004gwto]

I have an image that was initially generated by Midjourney and then upscaled using Topaz Gigapixel. Here are the details of the workflow and the issue I'm encountering:

Original Image Details:

Dimensions: 10752 px x 7168 px

Size: 441.0 MB

Resolution: 300 pixels/inch

Print Size: 91.03 cm x 60.69 cm

I resized the image to 50 cm x 40 cm.

The new pixel dimensions are 5906 px x 4724 px.

The resolution remained at 300 pixels/inch.

The file size changed to 159.6 MB.

Export Settings:

I exported the image as a JPG with the following settings:

Format: JPG

Quality: High

Image Size: 5906 px x 4724 px

Scale: 100%

Resample: Bicubic Automatic

Color Space: Convert to sRGB

Issue After Exporting:

Upon reopening the exported JPG file in Photoshop, the image size changed to:

Width: 208.35 cm

Height: 166.65 cm

Resolution: 72 pixels/inch

Dimensions: 5906 px x 4724 px

File Size: 79.8 MB

My question is :

Why does the print size of the image change to 208.35 cm x 166.65 cm with a resolution of 72 pixels/inch when reopening the file, even though it was set to 50 cm x 40 cm at 300 pixels/inch before export?

Could the upscaling process in Topaz Gigapixel affect the resolution and dimensions in a way that leads to this discrepancy?

How can I ensure that the image maintains the correct print size of 50 cm x 40 cm with a resolution of 300 pixels/inch throughout the entire workflow, including after exporting and reopening the file?

[Per Berntsen]

Export is designed to create images for screen viewing where the PPI value is irrelevant, so it is stripped out.

When you open the exported image in Photoshop, it has to assign a PPI value, so that rulers and text will display correctly.

This value happens to be 72, but could be anything.

Instead of exporting, use Save As / Save a copy, which will not strip out the PPI value.

[NB, colourmanagement]

@azzam33334004gwto I too recommend using "save as". As @Per Berntsen stated "export" is for Web

I hope this helps
neil barstow, colourmanagement net - adobe forum volunteer - co-author: 'getting colour right'
google me "neil barstow colourmanagement" for lots of free articles on colour management
Help others by clicking "Correct Answer" if the question is answered.
Found the answer elsewhere? Share it here. "Upvote" is for useful posts.