Resizing/Resampling Images for Best Display and Best Print Qualities

[myvancouver]

I know this is an old topic, but I cannot find the answer to a specific question I am asking.

I have created a new Photoshop document with the resolution at 300ppi.

I have an image on my computer that is 1000px x 1500px and under Properties and Details it shows the image as 96dpi. When I place the image as embedded in my PS document, in Image Size the image is shown as 96ppi instead of 96dpi. Does this mean my image is displaying on the screen at 96ppi?

What does it mean that I created the PS document at 300ppi, but the image is at 96ppi? In other words, how does the document 300ppi affect the 96ppi image on my display screen and when printing?

On resize only of the image, if I change it from 1000px x 1500px to 10,000px x 30,000px, will the image quality on my screen be reduced? Will the print quality be reduced? Does the resolution decrease as the image is stretched higher?

If I  RESAMPLE the image and change the image resolution from 96ppi to 300ppi does the display quality remain the same or does it increase, talking theoretically. We know that there is some degradation with resampling; that's not my question. Is resampling from 96ppi to 300ppi and adding more pixels suppose to increase display quality, stay the same quality, or gets noticeably worse quality.

Or, is the changing of an image resolution in PS only affecting the print quality and no effect on the display quality?

Thanks Community for your help!

[barbara_a]

• I have an image on my computer that is 1000px x 1500px and under Properties and Details it shows the image as 96dpi. When I place the image as embedded in my PS document, in Image Size the image is shown as 96ppi instead of 96dpi. Does this mean my image is displaying on the screen at 96ppi?

It means that the images itself is 96ppi. It does not mean the screen display.

•  Is resampling from 96ppi to 300ppi and adding more pixels suppose to increase display quality, stay the same quality, or gets noticeably worse quality.

It degrades the quality. 

• Or, is the changing of an image resolution in PS only affecting the print quality and no effect on the display quality?

The image resolution will display on screen at the same resolution as the monitor.

[Bojan Živković]

"What does it mean that I created the PS document at 300ppi, but the image is at 96ppi? In other words, how does the document 300ppi affect the 96ppi image on my display screen and when printing?"

If you try to place image 96ppi (it is for screen ppi for print it is called dpi but that is the same) using File > Place Embedded then image will be silently resized in the background to match document resolution what will cause increase in image pixel dimensions, that is how things works in Photoshop.

In your document resolution will not change, placed image will have document resolution because document layers can not have 2 different resolutions.

Hovewer, originally placed image resolution (and dimensions) will be preserved inside Smart Object layer what can be acessed and confirmed by editing Smart Object layer.

If you want to keep placed image as it is without any resampling during place process then change its resolution to match document resolution before of after placing image (turn off Resample in Image Size when changing resolution). If you are changing resolution afyer placcing it ensure that placed image is at 100% then edit Smart Object layer > go to Image Size > uncheck Resample > change resolution to match document resolution > save and close.