100% vs. actual size in Photo

[Endorphinity]

Embedded Photo Help gives no explanation, as to the difference between two zoom options I've put into the subject. I perceive them as duplicates. Can someone please explain, what is that difference, if any?

Also, what exactly does mean "Pixel size (⌘-9 on Mac)?

Edited October 21 by Endorphinity

[MikeTO]

100% will magnify to the same amount regardless of the image's DPI.

Actual size will magnify taking the DPI into account, so a 72 dpi image will be twice as large on screen as a 144 dpi image.

These commands do the same thing if the measurement system is set to anything other than pixels.

Having two commands makes sense for Photos which most users use in pixels but Publisher and Designer aren't pixel-centric apps so I think one of the commands should be removed from those apps. The other is just confusing to new users.

[Pšenda]

41 minutes ago, MikeTO said:

100% will magnify to the same amount regardless of the image's DPI.

For me, the explanation in Help is much more understandable - i.e. pixel to pixel.

 

P.S.

 

and other: https://www.google.com/search?q=Actual+size+site:https://forum.affinity.serif.com

Edited October 21 by Pšenda

[Endorphinity]

1 hour ago, MikeTO said:

100% will magnify to the same amount regardless of the image's DPI.

Actual size will magnify taking the DPI into account, so a 72 dpi image will be twice as large on screen as a 144 dpi image.

These commands do the same thing if the measurement system is set to anything other than pixels.

Having two commands makes sense for Photos which most users use in pixels but Publisher and Designer aren't pixel-centric apps so I think one of the commands should be removed from those apps. The other is just confusing to new users.

Not much clearer. This is confusing, to say the least, as DPI characterizes the resolution of output device, but not an original image per se. When I take the image with the camera, it only has dimensions in pixels (dots), without any relation to inches, and this is what I know when opening it.

 

[Endorphinity]

59 minutes ago, Pšenda said:

For me, the explanation in Help is much more understandable - i.e. pixel to pixel.

 

P.S.

 

and other: https://www.google.com/search?q=Actual+size+site:https://forum.affinity.serif.com

Dakujem,

I've relied only on site search, which didn't return to me this topic. Next time will rely on googling

[PaulEC]

2 hours ago, MikeTO said:

Having two commands makes sense for Photos which most users use in pixels but Publisher and Designer aren't pixel-centric apps so I think one of the commands should be removed from those apps. The other is just confusing to new users.

I have to disagree with removing commands/shortcuts that some experienced users may prefer, or be used to using, simply because they may confuse some new users who don't understand the reason for them! 

[Pšenda]

5 hours ago, Endorphinity said:

Next time will rely on googling

I recommend - searching the forum using specialized search services provides much more relevant results.

 

5 hours ago, Endorphinity said:

Not much clearer

I personally interpret these terms as follows:

"100%" 1 pixel on the monitor = 1 pixel of the image,

"Actual size" 1 cm on the monitor = 1 cm of the image.

[Pšenda]

4 hours ago, PaulEC said:

I have to disagree with removing commands/shortcuts that some experienced users may prefer, or be used to using, simply because they may confuse some new users who don't understand the reason for them! 

... even in ADesigner and APublisher it is possible to process pixel images, which may be convenient to display in pixel to pixel view.

[R C-R]

47 minutes ago, Pšenda said:

I personally interpret these terms as follows:

"100%" 1 pixel on the monitor = 1 pixel of the image,

"Actual size" 1 cm on the monitor = 1 cm of the image.

I pretty much do the same ... except for me the "Actual Size" is typically a small amount larger or smaller that the exact size. Don't know why.

[Oufti]

1 hour ago, R C-R said:

"Actual Size" is typically a small amount larger or smaller that the exact size. Don't know why.

At least there is always a little parallax error, due to the width of the glass. But maybe there is something else in your case. 

[Endorphinity]

9 hours ago, Pšenda said:

I personally interpret these terms as follows:

"100%" 1 pixel on the monitor = 1 pixel of the image,

"Actual size" 1 cm on the monitor = 1 cm of the image.

How can one measure image just imported from camera in cm? Camera sensor surely has a certain size in cm, but is it relevant?

[Pšenda]

4 hours ago, Endorphinity said:

Camera sensor surely has a certain size in cm, but is it relevant?

Of course it isn't. It is 1 cm if the Document unit is set to cm. In the case of the sensor, it is of course pixels.