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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Mar 15, 2013
I'm trying to show, using the eyedropper tool, the actual values of pixels in an 8-bit grayscale image (Mode command confirms that's what's there). In the Info panel, the eyedropper tool displays percentages for every type of color information (K, CMYK), while the "8-bit" field remains blank.
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Feb 19, 2012
Via VBA macro, some way of getting RGB/CMYK color values of a bitmap pixel by pixel?
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Sep 22, 2013
I'm using a Canon 40D, Photoshop 6 and a Mac Mini running OSX 10.8.4.
I'm loading a RAW image from my Camera into Photoshop in 16 bit mode. As I understand it, my Canon 40D has a 12-bit A/D and RAW images have a 12 bit depth out of the camera. Loading them in 8-bit depth would lose some dynamic range/resolution, so I choose to load them in 16 bit mode.
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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Jul 21, 2011
I am loving the painting tools in Mudbox, however I cannot find a way to paint on a non diffused model. Any trick to see 1 to 1 pixel values while painting?
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Jun 20, 2012
I need to look at the pixel intensity of a gray scale image to write some code. I have used some trivial softwares like paintshop pro earlier where you can see the pixel intensity being displayed along with the co ordinates of the pixels as you slide your mouse pointer across. In Gimp 2.8 for windows, i can see the co ordinates but not the intensity. My image is a grayscale image.
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Feb 6, 2014
I am interested in setting up a plugin that is able to read the greyscale values of a defined number of pixels throughout an image, average them, and then generate shapes based on the value output.
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Nov 7, 2005
I want to be able to do is darken selected areas of a pic.
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Nov 30, 2013
I want to darken the background (sky) as it is too bright?
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Feb 13, 2013
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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Jul 23, 2008
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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Sep 21, 2012
I have some hand drawings scanned into a computer that I want to clean up in Photoshop.I'm going to use the eraser tool to erase the smudges, though I want to darken the lines of the drawing without having to trace back over it with a pencil, pen, or paint brush. I played a bit by darkening the levels.
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Apr 11, 2013
When I crop a picture Pixel Demensions become 6 bytes Width and Height 1 pixel each. I can no longer see the picture. How can I fix this?
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Apr 22, 2013
I have two art objects on two layers. I want to match to the pixel the two objects that otherwise could be exactly the same but one layered object was imported slightly smaller.
The scale tool has good scale handling, I just want to measure the tool spots to the pixel to gain an exact scale size factor and match sizes.
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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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Jul 18, 2013
I have an attribute blocks and this att block has two tag values , is there a simple code for to change 1st tag values automaticly according to 2nd values ?
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
if i enter 501 valuse to 2nd tag then 1 st tag has to change as 150x510
I attached a jpg file for explain much better
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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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Jul 9, 2012
Is there a way to darken the color of multiple shapes all at once? Eg, If I had a number of shapes all in different, pastelle colors and wanted to see how those shapes would look in more prominent, darker vertions of themselves, how would I do that?
E.g., turning the light purple of the shape below to the dark purple in the image.
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Mar 6, 2012
In my Lightroom2 whenever I import my RAW files (I shoot RAW and JPG) they are automatically darkened in Lightroom and I don't know why. I'll import them and for a few seconds see how I shot them and how they should look and then when I click on the image in the DEVELOP module, it will change the exposure and make the picture about two stops darker. I don't understand why it is doing this. I shoot with a Canon 5d Mark II. I know it's not my camera, I have tried every setting on it. I believe Lightroom is compromising my images and darkening them.
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Apr 18, 2013
Is there a way to have no layer value set for the description keys. I set all the layers, and now I realize I'd rather set this to no layers (boxes are all unchecked). I'd rather see no value under the layer column, but there doesn't seem like a way to set this.
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Mar 13, 2011
I managed to remove the background, of an image,(A whit background) and put the image on top of a transparent layer. made a transparent image. When I place this image over a light color background, it looks fine, but when I place it over a dark color background, the edge of the image looks very rough and dirty, I think it's because some of the anti alias from the original image, how can I make it a clean image without going to delete pixel by pixel?
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Jul 26, 2012
We are developing an application using functionality of Gimp´s channel mixer with java.
Our problem is that we don’t Know how channel mix works exactly for transforming pixel by pixel in Java.
For example,
We have an image an do on it the next mix:
Output Channel = Red
Red=200.0
Green=0.0
Blue=0.0
For simulate that, we transform all pixels with Red Component *2 and 255 (maximum) if is greater.
Our problem is:
Output Channel = Red
Red=200.0
Green=60.0
Blue=0.0
How can I simulate that?
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Dec 21, 2012
Can AUTOCAD sum values that are entered as text values? Attached is a table text whose right final values should be all sumed up? Is this possible inside AUTOCAD?
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Jun 6, 2008
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.
The orange dress is vivid, and the white wall and door came out good also. The problem is that the lighting wasn't good enough to bring out the true skin tone of the person. So much so that the person's face could hardly be seen, and her neck and hands came out the same as her face also.
I tried to lighten her face by using the Ellipse in Tools>Adjustment>Brightness/Contrast making sure not to go outside the perimeter of the face. I then zoomed to 1600X and manually changed the rest of it a few pixels at a time by switching to the Rectangle in Tools . The result after more than an hour later was something that looked akin to pasting an egg in place of her face on the picture. It was grainy and looked ridiculous.
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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Mar 9, 2013
I'm looking to take a certain part of an image (a small shape of it) and then apply darkening, progressively, from that small area. That is, the image gets darker and darker as it radiates out from that shape. Like a vignette, but progressively darkening from the point rather than a strait darkness.
Tried playing around with curves and didn't really do this effect.
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Jan 6, 2013
is there a way to do this. darkening filename info in grid mode?
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Mar 6, 2012
This is happening in Lightroom 4 final and is possibly related to this issue: Re: Brightening shadows darkens highlightsBrightening shadows darkens highlights.
Start with a fresh imageSet Whites to a highish value, like 55-60 or better 100.Slowly move the Highlights or Shadows slider to the left
The image gets brighter even it is supposed to get darker. If you move Highlights to the positive side, the image gets darker.
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Mar 11, 2014
In my workflow, I am constantly editing symbols. However, when I enter a symbol, the stage is "darkened". The result is that I cannot effectively gauge colors as I edit symbol elements. How can I disable this "darkening" and see the normal colors?
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Sep 18, 2011
How do i darken and maybe thicken all lines in a line drawing?
I need to darken the grey lines in a two color (grey & green) line drawing since they are hard to see.
One way is a fill but there maybe some quick method that proportionately darkens just the grey pixels while preserving the relative grey gradient between grey pixels.
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Dec 6, 2012
I'm using Photoshop CS5 and as you can see on the picture below, when I set my grid line to every 1 px, grid doesn't match canvas pixel size.
Now I'm not able to draw sharp shapes using pen tool because even if I hold shift key everything gets blurry.
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Feb 22, 2013
As a Realtor I need to be able to show both exterior views through windows as well as the interior space. I have a Sony cybershot camera but cannot find any settings to allow for this. Is there a way to correct photos on Photoshop?....or do I need a special camera/lens or what?
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