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[Ale_SDC]

I created a montage, but when I zoom in the photo on the montage part appears much sharper than the original source, what can I do to make this difference not noticeable?

[rayek.elfin]

Reduce the new part's resolution and/or increase blurriness / noise to mirror the original source.

[jane-e]

"when I zoom in"

Zoom to 100%. Is it okay there? If so, then it's okay.

~ Jane

[Ale_SDC]

When zoom in is 100% ok, but I need It to be ok with more zoom.

[jane-e]

See this from Adobe Help. A zoom level of 100% is the most accurate view.

https://helpx.adobe.com/photoshop/using/viewing-images.html#display_images_at_100

~ Jane