Image quality

[Mustafa_Ahmed0472]

When I design an image with dimensions of 1080×1920, which are the dimensions for Instagram stories, the image becomes unclear when I save it. I have to save it in a larger size to ensure clarity, but when I resize it, it no longer works and I can't publish it on stories because the size has changed."

[Per Berntsen]

Can you post an image (not a screenshot but the actual image) that you consider to have low quality?

[hanomann]

try bicubic for resampling

[gregp53347583]

Try changing 300dpi (print resolution) to 72dpi (screen resolution). It will increase the dimensions of the file 4.17x the size while keeping the pixel size. 

So, uncheck resample and change 300 to 72.

[D Fosse]

@gregp53347583 

The ppi number is completely irrelevant on screen. It doesn't apply, it doesn't change anything.

On screen, the image pixels align to the screen pixel grid.

There is only one resolution on screen, and that's the physical screen resolution.

• If your screen is 1920 pixels wide, an image 1920 pixels wide will take up the full screen width.
• If the screen is 3840 pixels wide, that same image will take up exactly half the screen width.

Ppi has nothing to do with it.

Ppi is a print parameter. On paper there is no such pixel grid, and so one has to be invented. That's what the ppi number is.

[gregp53347583]

Yes, but the original post asks about quality viewing on screen. If it's 300dpi at the pixel size it would appear very small. At 72dpi it will appear at the size uploaded to social sites. It is very much a factor, mr

[gregp53347583]

To be clear a 1920w image at 300dpi will appear smaller than the same image at 72dpi. So if you zoom into the 300dpi to take fill the same amount of screen as the 72dpi image it will look low quality

[Per Berntsen]

"The case here is that they are seeing an image appearing small because it is 300dpi. It would be 4x bigger at 72dpi--the resolution it uploads to social."

It would be 4x bigger when printed, not on screen. PPI does not affect screen viewing.

The three images below all measure 800 x 533 pixels.

The first one has a PPI value of 1, the second 72, the third 300.

As you can see, they all display identically.

1 ppi

72 ppi

300 ppi

[gregp53347583]

Apologies... I was conflating this with a resample issue. I stand corrected.

[Per Berntsen]

PPI (Pixels Per Inch) is optional metadata used to calculate printed dimensions.

Pixel dimensions divided by PPI = Printed dimensions in inches.

A 1920 x 1080 image will print at 26.67 x 15 inches at 72 ppi, and at 6.4 x 3.6 inches at 300 ppi.

For screen viewing (which is the case here), the PPI value is irrelevant – the image will display at 1920 x 1080 pixels no matter what the PPI value is. It's not even required, the image will display correctly with no PPI value at all.

DPI (Dots per inch) is the number of ink dots a printer uses to print one inch of paper. It's a property of the printer, not the image.

[gregp53347583]

The case here is that they are seeing an image appearing small because it is 300dpi. It would be 4x bigger at 72dpi--the resolution it uploads to social. 

[gregp53347583]

Apologies... I was conflating this with a resample issue. I stand corrected. 

[gregp53347583]

Also, you say you're saving a LARGER size? When you enlarge an image in Photoshop it's not resizing it as much as it is stretching it and filling in blanks. If you were shrinking the image it wouldn't have the same issue. For enlarging images so you maintain quality you should consider using an AI software. A popular one is Topaz. It does a great job upscaling.