I had the very same question while while starting out. Do take a look at the detailed answer I later posted. How does Unity size graphics

When we set camera size, there's a certain screen height. This height is fixed irrespective of the device screen. On larger devices, greater detail, on smaller devices, lesser detail. So, if I chose 760px as height of my background image, I calculate camera size as follows: cameraSize= (Height/2)/PixelsPerUnit which in my case is, (760/2)/100=3.8

Next, I need to make sure skybox doesn't show irrespective of the device's screen size. This means, design background for the widest aspect ratio which is 16:9. So, I calculated the width as

width=AspectRatio X height. Which in my case is (16/9) X 760=1352 px.

So my background is 1352 X 760 pixel. This fits 16:9 aspect ratio perfectly. On narrower ratios like 4:3, there is cropping towards the sides. But skybox never shows. Which was my main issue.

I had the very same question while while starting out. Do take a look at the detailed answer I later posted. How does Unity size graphics

When we set camera size, there's a certain screen height. This height is fixed irrespective of the device screen. On larger devices, greater detail, on smaller devices, lesser detail. So, if I chose 760px as height of my background image, I calculate camera size as follows: cameraSize= (Height/2)/PixelsPerUnit which in my case is, (760/2)/100=3.8

Next, I need to make sure skybox doesn't show irrespective of the device's screen size. This means, design background for the widest aspect ratio which is 16:9. So, I calculated the width as

width=AspectRatio X height. Which in my case is (16/9) X 760=1352 px.

So my background is 1352 X 760 pixel. This fits 16:9 aspect ratio perfectly. On narrower ratios like 4:3, there is cropping towards the sides. But skybox never shows. Which was my main issue.

I had the very same question while while starting out. Do take a look at the detailed answer I later posted. How does Unity size graphics

I had the very same question while while starting out. Do take a look at the detailed answer I later posted. How does Unity size graphics

When we set camera size, there's a certain screen height. This height is fixed irrespective of the device screen. On larger devices, greater detail, on smaller devices, lesser detail. So, if I chose 760px as height of my background image, I calculate camera size as follows: cameraSize= (Height/2)/PixelsPerUnit which in my case is, (760/2)/100=3.8

Next, I need to make sure skybox doesn't show irrespective of the device's screen size. This means, design background for the widest aspect ratio which is 16:9. So, I calculated the width as

width=AspectRatio X height. Which in my case is (16/9) X 760=1352 px.

So my background is 1352 X 760 pixel. This fits 16:9 aspect ratio perfectly. On narrower ratios like 4:3, there is cropping towards the sides. But skybox never shows. Which was my main issue.