--- "After that shutter closes it’s all over. The physical light captured on film is all that is left, a history of light preserved in chemical form, and I have to move on to the next one."
Registered: 01-2011 Location: Doncaster South Yorkshire Posts: 728
Re: Contrast Grading Theory I would not recommend you desaturate to -100 if your original image is derived from an RGB file unless all you need to do is remove colour from the image.
Its all about the collision of the three channels, R G B and the way which you collide these channels will give you greater control of both tonality and luminosity.
The Contrast Masking approach will work better if you start out with the best colour file you possibly can and in some cases this may mean increasing colour luminosity with adjacent colours as this will give you greater separation on tonality for when you start to use the Contrast Masking tools.
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Registered: 08-2014 Location: Up Naarfolk Posts: 1817
Re: Contrast Grading Theory
quote:
IanBarber wrote:
I would not recommend you desaturate to -100 if your original image is derived from an RGB file unless all you need to do is remove colour from the image.
Its all about the collision of the three channels, R G B and the way which you collide these channels will give you greater control of both tonality and luminosity.
The Contrast Masking approach will work better if you start out with the best colour file you possibly can and in some cases this may mean increasing colour luminosity with adjacent colours as this will give you greater separation on tonality for when you start to use the Contrast Masking tools.
Sure - but i the example above , you would already have done that in LR or ACR wouldn't you before bringing into photoshop
But my question really was concerning the difference in sharpness, not contrast, between the different methods Martin shows in his video
It appears that the CM method gives a sharper starting point than the BW filter in ps
I'd love to see a similar comparison done between images opened in Ps and those prepared with te various methods in LR
e.g. would there be a difference betweenusing the BE conversion in LR and desaturating in LR in apprarent sharpness
I imagine that shift in Ps in sharpness between the two methods was due to the same effects to some degree that yu'd get if you upped the green too much or loweredthe blue to much - it appears to lose sharpness in the image
Anyway - point being - we spend a fortune and expend loads of effort to get resolution and sharpness, well, if it's being sloughed off at the outset then were not doijg ourselcves any favours, so IF the initial conversion to BW method has a part to play in this then we need to explore it in depth
--- I am a part of what I am, not apart from what I dream,
That's a part of what I seem, but not apart from what I am
Registered: 01-2011 Location: Doncaster South Yorkshire Posts: 728
Re: Contrast Grading Theory i am wondering if you are referring to position 6:30 in the video.
The shadows on the leaf on the right hand image are going to be darker because a curves adjustment was applied to it and the curve was pulled down so all the darker values by default would have become darker.
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Registered: 08-2014 Location: Up Naarfolk Posts: 1817
Re: Contrast Grading Theory
quote:
IanBarber wrote:
i am wondering if you are referring to position 6:30 in the video.
The shadows on the leaf on the right hand image are going to be darker because a curves adjustment was applied to it and the curve was pulled down so all the darker values by default would have become darker.
4:47-5:15 approx
he's talking about SHARPNESS
Last edited by Digital Finger, 13/Sep/14, 10:15 am
--- I am a part of what I am, not apart from what I dream,
That's a part of what I seem, but not apart from what I am
Registered: 01-2011 Location: Doncaster South Yorkshire Posts: 728
Re: Contrast Grading Theory I am not sure how or why a conversion from Colour to Monochrome can change sharpness.
The only thing that I can see having looked agin at the video is perceptual sharpness.
Because a curve adjustment was made on the right image and that curve was pulled down, perceptually, the edge contrast of the leaf may appear to look sharper due to the shift in contrast.
--- Photoshop Panels - Actions - eBooks and more..
http://www.digitalblackandwhite.co.uk
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Registered: 01-2006 Location: West Yorkshire Posts: 6449
Re: Contrast Grading Theory Well the images where both put into PS, I did not do any adjustments only ticked the conversion boxes in the Black and White conversion and Channel mixer, the Channel mixer did visually look sharper on screen.
Maybe it because the Black and White conversion tool uses different logarithms and all the channels, however I cannot confirm that.
--- "After that shutter closes it’s all over. The physical light captured on film is all that is left, a history of light preserved in chemical form, and I have to move on to the next one."
Registered: 08-2014 Location: Up Naarfolk Posts: 1817
Re: Contrast Grading Theory
quote:
martinimages wrote:
Well the images where both put into PS, I did not do any adjustments only ticked the conversion boxes in the Black and White conversion and Channel mixer, the Channel mixer did visually look sharper on screen.
Maybe it because the Black and White conversion tool uses different logarithms and all the channels, however I cannot confirm that.
Ihave been doing some tests and certainly think that the contrast appears different which might explain it but will also try some moreexacting tests
--- I am a part of what I am, not apart from what I dream,
That's a part of what I seem, but not apart from what I am
