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FORUMS Cameras, Lenses & Accessories Small Compact Digitals by Canon 
Thread started 12 Mar 2011 (Saturday) 13:40
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S95 in BW mode help w/ example

 
casperc
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Mar 12, 2011 13:40 |  #1

Looking for some technique help... love my S95 but when I shoot in B/W mode the exposures seem to be off. The contrast is very low and the metering seems to be incorrect as well. Anyone else have this issue, and suggest a solution? I have looked in this forum for answers but haven't seen anything so far, so forgive if this has been asked and answered. No such trouble in the color modes, only B/W. Also, I can correct this in PP of course, by adjusting levels and contrast, but would rather have shots come out OK "in camera." Example attached (my daughter and her smile!) should show what I'm talking about... straight from the SD card, exposure comp set to 0, BW "on", P mode, RAW. Thanks much for the input!


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Tee ­ Why
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Mar 12, 2011 14:36 |  #2

Seems like the white background confused the metering into underexposing. Some +EVC would help.
If the b/w's are lacking contrast, in picture styles in the camera, I'd turn up the contrast a bit up.

Good luck.


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casperc
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Mar 12, 2011 15:31 as a reply to  @ Tee Why's post |  #3

Thanks much. Of course, the white bkgd would throw things off, I should have mentioned that I get the same results irrespective of the background. I wasn't familiar with the contrast adjustment (I really miss not having a printed manual come with the cam!) but will give that a shot. Thank you again!




  
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ApGfoo
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Mar 12, 2011 17:34 as a reply to  @ casperc's post |  #4

I get better results shooting in color then converting to black and white on my computer. I would also use a lower ISO to reduce grain unless you want grain.


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tkbslc
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Mar 15, 2011 23:08 |  #5

Well since you mentioned RAW, you just need to go into DPP and monkey with the exposure, contrast, filter effect and sharpness.

Another fun B+W mode is the "nostalgia" scene mode. Turn the ring until it gets over the the last two levels and you'll get crazy contrast and nice grain effects.


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dexdex
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Mar 16, 2011 03:52 |  #6

I'd also recommend, if possible, to shoot straight ahead in color, using whatever your preferred mode is, and convert to b&w on your computer. Usually, you need to work on contrast to get good b&w results, even more if you print on paper. Most softwares, like Photoshop Elements, have some interesting tools for b&w conversion.


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casperc
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Mar 16, 2011 18:53 |  #7

Thanks much for the recos, sounds like the conversion is best done outside the camera! I have done that for years so not sure why I jumped into "in camera" this time –*I guess just because of the novelty. Thank you again –*C




  
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exwintech
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Mar 17, 2011 15:55 as a reply to  @ casperc's post |  #8

Casperc - I'd tend to go with those advising to do a colour image initially.

Firstly - doing that, you "do have" the colour version if family or friends want that instead. Also, kids who want copies to take to school, or for collections, often aren't much into appreciating the art-value of B&W, and prefer the "brighter" colour versions.

Where I'm coming from is having an SX10 for over 2 years - which does very good Superfine JPEGs, then having a Fuji HS10 about 8 months - which has the RAW and RAW+JPEG options - but one doesn't always have RAW selected when something happens...

After initial experiments "to see what the camera itself does", I haven't used the B&W in-camera functions. With JPEGs, which have limited data content anyway, you can do very little later to what minimal data is left in a camera B&W conversion.

Even as JPEG, the colour image does have a lot more information in it. The camera B&W is a 1-channel greyscale image only. Very little "info left in it". But if you have the colour image, you have the RGB channels, and even if very limited compared with RAW, the 3 channels have more depth and dynamic range than a single greyscale image.

To do anything other than very mild 'tweaks' to JPEGs, as that's a very "lossy" format, convert the JPEG to a "non-lossy" format. With Photoshop, PSD - Gimp, XCF, and TIFF will work in either. (A TIFF converted JPEG handles much as a TIFF output from RAW processing, except of course has less information in it to use.)

I'll assume you're using Photoshop, but Gimp and others have similar functions. Open the TIFF (or PSD) in Photoshop. Then open the Channel Mixer dialog. At the bottom of that is a checkbox 'Monochrome' - so select that, and 'Output' in the top field will change to 'Gray'.

You then have the RGB sliders still active - and an adjustable 'Constant' slider below them. Leave that centred until you have the best result selectable from the RGB sliders. If not then as desired, try altering the Constant in small increments and use RGB sliders again.

Using the RGB sliders, you'll find that you can bring out more detail in shadows, and also have a more accurate range of "shades of gray", contrasts, and depth, than the camera's "greyscale conversion" - what it's actually doing is little better than a processor-preset "desaturate" function.

As P&S, however good, sensors tend to be noisy, you can with the RGB sliders, watch the darker regions of the image - and those that are close to being "1 shade", such as sky or flat water - and adjust for visible noise. Use small adjustments on the Constant bar to lessen noise, while keeping the other ranges of shades as you want them.

When you have the result desired, click OK and close the dialog. You can then fine-tune with the 'Levels' dialog. If you think you need to Sharpen - use USM - but only with small amounts and a narrow radius. Be gentle on it - there's less information in the mono image, so small amounts will have a 'harder' effect.

Obviously, you can do all of that, and better, as you'll have more info in the output TIFF, with processed RAW files - but you can of course do more in the RAW processing, too.... This is just what you "can" do with good JPEGs - if you forget to select RAW - or didn't have time to without losing the image-instant.

Or, if, like my SX10 - the camera doesn't natively do RAW, anyway...

Dave.




  
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S95 in BW mode help w/ example
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