Photoshop :: Darkening Pixel Values

Jul 21, 2004

I am trying to quantitate data on some black and white microscope pictures I took, but the images are too bright in parts and I need to darken them down.

Is there a way that I can use photoshop to darken certain pixel values within the photo?

I have tried adjusting the levels in the picture so that the greys are limited, and I have tried changing the greyscale, but to no avail.

I need to make it so that two images have the same pixel values so that they can be calculated evenly.

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Photoshop :: Image With Color Picker To See Pixel Values

Sep 22, 2013

I'm using a Canon 40D, Photoshop 6 and a Mac Mini running OSX 10.8.4.
 
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Once the RAW image is in Photoshop in 16 bits, I scroll over parts of the image with the color picker to see the pixel values.  This is where I lose understanding of what's going on.  The color picker shows pure white values as 32768 and pure black values as zero.  Apparently Photoshop (or Camera Raw) is shifting the 12-bit camera data up to fill the top 16 bits in Photoshop.  But this is not entirely true!  If it truly shifted all 12 camera bits into the 12 MSBs of the 16 bit Photoshop value, wouldn't the max white value be 65535??  If the 12 bits were shifted into the 15th bit, wouldn't the max value be 32767??  Where does 32768 come from?  Also, what is Photoshop putting into the LSBs after it does the shifting?
 
I'm trying to do some averaging of lots of low light exposures using Linear Dodge in 16 bit mode.  If photoshop indeed shifts the 12-bit camera values to the MSB of the 16 bit word, I'll eventually run into clipping when I sum my images.  I'd have to go to 32-bit mode and that really slows down my system, almost to the point of uselessness.
 
What's going on in 16-bit mode? 

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I work with floorplans a lot in my job and I come across this a lot so I figured I'd ask to save me a ton of time. Sometimes I get floorplans in a PDF format that I have to edit in Photoshop. Sometimes, the floorplans come to me very light (the black outlines of walls, doors, the building, etc.) are not as dark as I need them to be. I've tried to go to the Adjustments Menu --> Curves and darkened it that way. But then when I go to flatten the picture, it goes back to the light black color it was before. Is there any way to make the lines darker and to stay darker?

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I'm doing a series of illustrations for a client. I scanned in the black and white inked drawings and then colored them in Photoshop 7 as TIFFs. I worked in CMYK mode the whole time.

when I look at a thumbnail of the saved TIFFs or open them in any other application (windows picture & fax viewer, paint, etc.) I get these dark and murky colors. I get these same murky colors printing from these applications. However, if I open the TIFF image in Photoshop the colors go back to the way they should be. They also print correctly from Photoshop. If I save the image as a JPEG, the colors save correctly.

My client just printed off the first round of proofs (from a laser printer, I assume) and the colors are dark and murky.
The problem is that they want the images sent as TIFFs and I don't know what the four color offset printer is going to do.

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May 12, 2007

It blows my mind that somthing this simple isnt all that simple. I used the eyedropper tool to slect a color from another photo, then used the brush while fully magnified to change the color of each pixel.

It was coming out a weird greyish color, and I noticed that if I clicked more than once, it got darker, but so did the pixels directly around the one i was editing. So, i copied both pictures, loaded them into paint, and went to town.

It worked, but then when i copied it back into photoshop, it had a black background (there was no background in the original pictures) around the sprite I was editing. I tried to use the magic wand tool to get rid of it, but it took parts of the sprite with it, so...

Is there any way that I can edit the color of a single pixel (or hell, even a group of pixels if they share the same exact color would be nice...preferred, even) accurately? If not, what program could I use that would keep the transparent background?

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for example :

1st tag (50x50) - 2nd tag ( 100 )    ==> 50x50-100

if i enter 201 valuse to 2nd tag then 1 st tag has to change as 100x100

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I attached a jpg file for explain much better

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GIMP :: How To Prevent Photo From Darkening

Dec 23, 2011

I have a camera I like, but a problem with it. I took a few indoor photos and it took awhile to get enough light arranged for them. When I put the camera's SD card in the card reader and looked at the photos they looked great. I copied the photos to a folder then deleted everything on the card to get it ready for the next photos.

Then when I look at the photos from the desktop folder, they are much darker. I don't do this a lot but it has happened at least once before, and I think it does that all the time. Possible to just lighten photos with Gimp?

I did find a page that said you could, but it is probably an old page, at brighten dark photo with Gimp. It instructs me to Quote:Duplicate the original image layer in the layers dialog. Change the Mode of this duplicated layer to Value -mode to use this layer for a retouching brightening of colors.

When I create a duplicate layer, click on image, hover over mode, none of the options are value. Maybe that was for an older version of Gimp? The page doesn't have a date which isn't nice.

What the problem might be between the Canon view, and the windows 7 view? Is there something I can tweak in 7?

Edit: I found it in the colors > brightness and contrast, but maybe I can leave this up in case someone knows how to stop the darkening from happening in the first place. The photo quality isn't as good as it was in the Canon folder.

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For example,

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Output Channel = Red
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I need to know the best way to lighten part of a picture without it being two-toned. An example of this is when I took a picture of someone inside a house.

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I don't want to lighten the whole picture because it ruins the true color of the dress, and not as important, the door and walls don't look as sharp and vivid either.

P.S. I would also like to know how to do the reverse; darken a specific area without the two-toned look.

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