Hi All
I am trying to interpret camera exposure from a Photoshop point of view. Just wondered has anyone used the Filter > Blur > Average function. and to tell me whether my thinking is correct for the below.
1. I open up a photo that I have taken in Photshop CS2
2. I set my histogram to show luminosity from the drop down menu and then apply the filter. Filter > Blur > Average.
When you apply the filter. Filter > Blur > Average.. to a photographic image in Photoshop. It changes the photographic image to a grey tone photograph. Lets say with a MEAN value of 191 luminosity as shown in the luminosity histogram.
This Filter applied in Photoshopto a Photograph. Is this equivalent to how the camera metering system averages the scene to obtain a middle tone value? Once it has this mean value any pixels that falls exactly as 191 luminosity will be exposed by the camera as 18 percent middle grey tone.
Any pixels above value of 191 luminosity will be exposed as highlights
Any pixels below the value of 191 luminosity will be exposed as shadows
I hope Iam making sense
Thanks in advance.
I am trying to interpret camera exposure from a Photoshop point of view. Just wondered has anyone used the Filter > Blur > Average function. and to tell me whether my thinking is correct for the below.
1. I open up a photo that I have taken in Photshop CS2
2. I set my histogram to show luminosity from the drop down menu and then apply the filter. Filter > Blur > Average.
When you apply the filter. Filter > Blur > Average.. to a photographic image in Photoshop. It changes the photographic image to a grey tone photograph. Lets say with a MEAN value of 191 luminosity as shown in the luminosity histogram.
This Filter applied in Photoshopto a Photograph. Is this equivalent to how the camera metering system averages the scene to obtain a middle tone value? Once it has this mean value any pixels that falls exactly as 191 luminosity will be exposed by the camera as 18 percent middle grey tone.
Any pixels above value of 191 luminosity will be exposed as highlights
Any pixels below the value of 191 luminosity will be exposed as shadows
I hope Iam making sense
Thanks in advance.