I have searched the forums and can not find an answer to this question.
If have two pictures of the same size, taken on the same camera with the same settings.
When I open one in Photoshop it opens at 72 dpi.
The second one opens at 300 dpi.
Please can someone explain why Photoshop does this or is it something I am doing?
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?
I have an image that is in grayscale and I need a table that displays each pixels grayscale value. Is there a way to save the image in some tabular format or can I convert it any other way in photoshop?
View 13 Replies View RelatedI'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.
View 9 Replies View RelatedI am creating an image of 150mm x 100mm at 300dpi but photoshop keeps adding decimal points like 150.02 when i change the image from the original size, is it something I am doing wrong or a known bug? You would expect that when you change an image to 150 x 100mm it would stay at that size and not be added to.
View 2 Replies View RelatedI 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
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.
View 1 Replies View RelatedI made a simple poster using photoshop to make the background and illustrator to make the fonts and some other stuff. In CMYK my black is just 100% K ( in photoshop)
When placing image in illustrator the 100% K (black) changes to different black with C M Y added. But then when I save it as PDF the preview shows black as a bit grey (which is something normal- in print it will be just black). So my question is .. should I change enything just to be able to see a 100% K in illustrator in order to match CMYK values of Photoshop? Or should I leave it this way? I guess if I am getting a "grey" in PDF preview is something good isn'it? because in photoshop when I set to 100%K in my screeen it looks like grey and not total black.
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?
View 9 Replies View RelatedWorking in Photoshop 6, I have a .png file where I want to select a portion of the image and adjust the RGB values to particular numbers (in this case, R = 66, G = 79, and B = 87). Normally, I could use the Paint Bucket tool to fill in the selected area, but in this case, the selected area has fine lines in it that would be wiped out by the Paint Bucket tool.
I went to Image --> Adjust --> Color Balance, where I can fiddle with the RGB values. Is there a way, using this tool, to adjust the color levels to match the desired R, G, and B values? Or is it trial and error?
If not, is there another way, other than Paint Bucket or Color Balance, to achieve what I want?
Since upgrading to Photoshop CC I cannot change my tracking values. If I type in 100 it shows 57; if I type in 200 it shows 118.
View 1 Replies View RelatedIn Step #9 it mentions negative values and Photoshop CS5 does not allow negative values ? It mentions a diameter setting, which got replaced by a size setting in CS5, once again I can't enter in negative values ?
View 2 Replies View RelatedIs it possible to extract raw luminance values from raw image files? Actually, a de-Bayerized flat matrix would be ideal but could (? maybe) deal with a 3 layer RGB matrix -- rather like the output from dcraw, only in PS. Preferably without gamma applied.
What I'd like to do: I'd like to use image stacking for exposure accumulation using "summation" but find that highlights blow out readily. Right now the workaround is to let the highlights go and bring them back with HDR from one (or more) of the original frames, but that's seriously clunky. I'd like a "scaled summation" where a luminance-dependent scaling factor is applied in the sum. I don't yet know how to get there from here in PS (there's a megaclunky way involving dcraw, Matlab, and a stacking program ...), but it seems to me that the first step is to get the luminance info.
There is a noticeable difference between color values specified in Pantone books/Color Manager and CS6. For instance, the correct RGB value for Pantone 158 CP should be 228/126/26, whereas Photoshop's RGB value for the same color is 245/127/41.
I have a subscription to Creative Cloud and all applications are up to date. When will this be fixed?
The input tonal value is 70% of a CMYK primitive color, e.g. cyan, using Photoshop's color picker.
For measuring the tonal values and differences, switch the info palette to CMYK and 32-bit mode. It's also possible to see the differences in HSB and Lab mode (depends on selected CYMK color profile).
Measured values of filled layers using different Photoshop functions: .....
In Photoshop 7 where it shows the information about the photo being worked on there is a list of EXIF tag numbers with values. What are these and what do they mean?
View 1 Replies View RelatedI 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.
I like to work in a real 16bit (per channel) RGB mode.
When I create a new RGB image with 16bit there are only 8bit values (0-255 and not 0-1023) in the color picker and in my info panel.
Is PS CS2 just working internally with 16bit and doesn't provide manual access to all values?
make CD labels with Photoshop?
I'm trying to make full face labels (that go all the way to the hole), but I can't even find any label maker software that offers this. I don't know of a way to make anything but quadrilateral images in Photoshop.
I have a portrait shot on a grey cloth background and I need to remove the grey background.
Replace color is useless, as is the magic wand.
However the BG is comprised of pixels that are all VERY close to neutral ie
Red -231
Green - 232
Blue - 231
etc
I am trying to find a way to select only those pixels that are within 1 or 2 from the other components, ie it would select for the above selection:
Red - 230-232
Green - 231-233
Blue - 230-232
Is it possible to export current swatches palette as a list of hexadecimal and HSL values?
View 5 Replies View RelatedI just upgraded to CC from CS4. In CS4, when recording an action I could set the rulers to percent and a percentage-based value would be recorded rather than a pixel value. For example, if I recorded the creation of a vector shape that filled the entire canvas, the step in the action would create a 100% by 100% shape, starting at point 0%, 0%. This allowed me to run a batch on varying canvas sizes, and get a shape that filled the canvas no matter the size. In CC, it always records pixel-based values no matter what the rulers are set to.
View 1 Replies View RelatedWhen I have sRGB selected as my color space in Photoshop (CS6), often I see the out of gamut warning in the color picker. I expected every possible sRGB color value to be within the sRGB color gamut, but apparently I was wrong. I would like to see a horseshoe color space diagram that shows how far the values extend beyond the gamut.
I guess this occurs with all color spaces - you can select color values that are outside of the gamut. I'm not sure what the color space diagrams represent, but I'm guessing they represent the gamut.
So I am measuring the 'red' 'green' and 'blue' values of a picture after I adjust the white balance with a grey card.. I notice that if I measure the colors from 'selected layer' they are different then if I select 'entire image' those are both different if i do not do any white balance adjustment..
Which is the correct measurement that I should record? I want the the white balance adjustment included.
if I have a white point that's 231/217/183 (3x3 sample) and I also have a 228/228/228, which is the better to select as my white point? I've never been confident on whether it's better to get closest high values or highest value in one of the RGB points.
View 4 Replies View RelatedI open my file (which has an embedded srgb color profile) in photoshop (my rgb values are 246/205/218). When I use the color picker, it confirms that my color is accurate. Then I save the file as a JPEG (using maximum-12, and baseline), also embedding the same srgb color profile into the photo (which is also my working space btw). Then when I reopen the JPEG file in photoshop, and use the color picker.... my srgb values are (246/205/219). The difference is so small that it doesn't make a huge difference, but why is this happening? My PSD file has of course maintained the original rgb values.
View 14 Replies View RelatedI have a client who asked for a SPECIFIC shade of blue which happens to be 100,70,0,0. Now I know my screen will never show the exact color, always shows lighter. This part is ok. But I go and change the values on the color picker, and then 10 minutes later when I come back to it, the values changed to 95,65,1,0. Why would this happen, it KEEPS happening and not just one one color, on ALL OF THEM, it just changes the numbers slightly fromw hat I put in.
View 2 Replies View RelatedI have a photo of an object on a black background, and during the editing process the cmyk values of the black background are c=75 m=68 y=67 k=90. As this image is to be placed on a business card, if it is possible to change the values to 100% K or 40% C 100 %.
View 3 Replies View RelatedAbout color lab color correction, in those days i'm watching a lot of tutorials about cause i'm trying to understand this new to me subject in a better way.
While neutralizing color, correcting a photo in Lab by Curvas adj Layer, the default eye dropper values are:
Black- 0, Gray- 128, White- 255 RGB (0-54-100 Lab)
To prevent the possibility of out of gamma some tutorials suggest to change the above mentioned default values:
Black from 0 to 26 RGB (0-6 Lab), White from 255 to 243 RGB (0-96 Lab)
What about the middle eye dropper Gray? A few tutorials mention to chage the gray value too from 128 to 133 RGB (54-56Lab) while the majority never mention gray value, they tell about black and white never mentioning the gray value; what is your experience about?
The above mentioned "out of gamma problem" is mainly related to output printing or to screen displaying too?
Generally speaking I would like to receive some comment by you gurus about this very subject, while working in Lab, what about your Curvas adj Layer eye dropper values, do you change them or you leave them as default?
As the title points out I need to find an average of the L, a, b values from a region of a photo. I can find out the values for a single pixel but these values vary to some degree in the region I am interested in. If this can not be done in photoshop but in an other program i'd be if you could show me how.
View 8 Replies View RelatedI'm currently recording the median luminosity and standard deviation of luminosity values in various photographs. This has been an ongoing project so I've been working on it for probably the last 4 months. Today I resumed my work and had to go back and check a previous photo that I had already recorded luminosity values for and noticed that the luminosity values that I had originally recorded were different than the values I'm seeing today in the histogram.
The attached picture shows the histogram I'm using (and have been using since I started this project). It is showing a median luminosity and standard deviation of luminosity for a photo that originally gave me this median luminosity value: 75 and this standard deviation: 27.87
I accidentally changed some setting in photoshop that affected the luminosity readings, or if the luminosity values of a photo are estimated by photoshop and thus aren't always the same etc. ?