Quick Photoshop question

Discussion in 'Digital Discussion & Q&A' started by Richard Austin, Jul 26, 2007.

  1. Richard Austin

    Richard Austin TPF Noob!

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    I wonder if someone can provide feedback on this question...

    I'm working in greyscale in Photoshop and whenever I use the 'Curves' or 'Brightness/Contrast' functionality I find, after making and previewing changes, that the chenges are not fully made to my image. The contrast/brightness changes are less than shown in the preview window.

    After making the changes, I can see a kind of additional 'grey level' placed over my image by Photoshop and the amount of contrast/brightness I requested is not occuring.

    Is there some preference of some control I have missed that is stopping the contrast/brightness changes being made as I would like?

    The images are 8-bit, greyscale.

    Thanks for any asisstance!
     
  2. The_Traveler

    The_Traveler Completely Counter-dependent Supporting Member

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    Does this happen with a b/w image in RGB mode?
     
  3. glaston

    glaston TPF Noob!

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    The brightness/contrast adjustment is crap, unless you're using CS3 avoid it at all costs.
    Are the images coming into the computer in grayscale?

    I find that the best workflow is to edit images in RGB, then convert to grayscale using the channel mixer if you're using CS2 or below, or a B&W adjustment layer if you're using CS3.

    Is there a specific reason that you're working in grayscale mode?
     
  4. Doug

    Doug TPF Noob!

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    Hello Richard,

    I don't know if I even qualify to answer your question but I have a way of converting color image to black and white that might help when it comes to adjusting the Curves, Brightness and Contrast.

    First open your color image then click on:

    1. Image / Mode / Lab
    2. Lightness Channel
    3. Image / Mode / Grayscale
    4. Image / Mode / RGB
    5. Save as ...

    Hope this helps
     
  5. Flash Harry

    Flash Harry TPF Noob!

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    ditch the greyscale, google dr brown and download his scripts or follow his tutorials, pretty much as above but the scripts do it for ya. H
     
  6. warrenmarcus

    warrenmarcus TPF Noob!

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    Try flatten the image first and start over again.
     
  7. Richard Austin

    Richard Austin TPF Noob!

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    No, I've converted the RGB images to greyscale.
     
  8. Richard Austin

    Richard Austin TPF Noob!

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    Yes, I've used the Channel Mixer to get my images into B&W, but then wanted to use a 'grain' filter and found I got better effects by also converting into greyscale.
     
  9. Richard Austin

    Richard Austin TPF Noob!

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    Thanks! Haven't tried that, so will check it out... :)
     
  10. Richard Austin

    Richard Austin TPF Noob!

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    Thanks for the tip. I googled 'dr brown' but all I got was "Dr. Brown's Natural Flow® Baby Bottle and Breast Pumps"!
    Couldn't see anything on the Goolge page for his tutorials. Do you have a URL? Thanks :)
     
  11. Richard Austin

    Richard Austin TPF Noob!

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    Will try that, but I'm thinking now the problem may lie with me using a 'grain' filter and then using Curves to further change contrast. The grain fiilter may 'smudge' things together after each Curve settings change....
     

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