Is there a free way possible to open an image in a PC environment, click on the image, and obtain the RGBA value on the pixel that you clicked? I'm looking for a way to do this in a PC Windows environment.   Edit: This question asks specifically about RGBA, which is not addressed at the marked duplicate .  I don't believe any of the answers there have a way to obtain an alpha value. (RGBA as opposed to RGB).
123435
How can I pick a color from an image?  When I move the cursor to any particular point in the image, I want the hex code of the color at the cursor to be displayed.  I would like to be able to do that with anything displayed on the screen even if it is not an Image, say I am working on any Windows application having various colors.    Is there a way to do that?
20191
When opening a new image from a PNG file in Illustrator as the background for my artboard to trace over I am not able to select any color swatches the only available options are [none] and [registration].  I have black and white available for gradients but thats it. I have checked the color settings and they are set to RGB.  Has anyone come across this before, I'm hoping to either force colors or else find a way to add images from a file into the artboard as when I create a new document the standard colors are all present.  The weird thing is I have just traced round a photo and I cannot remember having this problem in the past!
105672
Is there a simple way to display a color bitmap in grayscale with just HTML/CSS?  It doesn't need to be IE-compatible (and I imagine it won't be) -- if it works in FF3 and/or Sf3, that's good enough for me.  I know I can do it with both SVG and Canvas, but that seems like a lot of work right now.    Is there a truly lazy person's way to do this?
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Every time I want to save an image I've pasted into the  application, it chooses a BMP/DIB format (which is the worst for saving things from the clipboard).  How can I hack Paint into defaulting to the JPEG format when saving images?  I am using Windows XP SP3 and Paint 5.1 at the moment. I hope though that any hacks might be generic and I'd be able to use them across all my Windows machines.
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I have layer (ImageWMS that has GeoTIFF format) and also OSM or another for my baselayer. According to  I should get pixel[0] and pixel[1] and pixel[2] to calculate height . But I have an image layer and when clicked on image layer I received pixel values of base layer not image layer. So I added filter to my codes for showing just image layer's pixel value but console show me (NON). How can I find the pixel value of image layer or better way for calculate height from image layer (raster layer .tiff)? Here is my code : const UnTiled = new ol.layer.Image({         opacity:0.9,         title:'UnTiled',         source: new ol.source.ImageWMS({             ratio: 1,             url: 'http://localhost:8080/geoserver/world/wms',             params: {                      'VERSION': '1.1.1',                     &quot;STYLES&quot;: '',                   &quot;LAYERS&quot;: 'world:world',                   &quot;exceptions&quot;: 'application/vnd.ogc.se_inimage',             }                    })                    });map.addLayer(UnTiled);  map.on('singleclick', function(evt) { map.forEachLayerAtPixel(     evt.pixel,     function (layer, pixel) {       var height =         -10000 + (pixel[0] * 256 * 256 + pixel[1] * 256 + pixel[2]) * 0.1;         console.log(height)     },     {       layerFilter: function (layer) {         return layer === UnTiled;       },     }   ); })
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I want to put a 2D image on a 3D object in Blender. How do I do that?  I have found the "textures" tab in the "properties" window, but I can't figure out what to do with it.  Preferably, I would like to click and drag an image off my desktop right onto the object.
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I'm looking for a desktop search engine for finding images on my local hard drive with high visual similarity. I've only found paid for ones so far. It could be Linux or windows one, either would be helpful.  A Google desktop plug-in would be nice!
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Do I have to do something "special" to get the Color -> Color to alpha menu option to work in GIMP? I am trying to convert a background color on a GIF image to transparent by converting the background color to an alpha channel but the Color to Alpha menu option is not selectable.  I've gone through the GIMP documentation and it looks pretty simple :-) I must be missing something rather obvious here!
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Is there a cheap way to get the dimensions of an image (jpg, png, ...)? Preferably, I would like to achieve this using only the standard class library (because of hosting restrictions). I know that it should be relatively easy to read the image header and parse it myself, but it seems that something like this should be already there. Also, I’ve verified that the following piece of code reads the entire image (which I don’t want):  using System; using System.Drawing;  namespace Test {     class Program     {         static void Main(string[] args)         {             Image img = new Bitmap("test.png");             System.Console.WriteLine(img.Width + " x " + img.Height);         }     } }
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Because of the recent Web accessibility Law in my region, I need to ensure I'm designing with an appropriate contrast ratio.  WCAG says the value of this ratio is 4.5:1    How do I figure this out in in Photoshop and Illustrator?
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I'm curious to see some real examples of where simply capturing the same photo in RAW (and being processed by someone who can do it justice) has significantly improved the photo at the end of the process.  I understand what RAW is and why you might want to use it over JPEG, however, I'd like to actually see some examples where it has allowed for a better result. More control over tone, conversion from the more detailed data to 8-bit RGB etc.  Does anyone have or know of some processed RAW+JPEG shots for exact comparison?
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I've found that when you load a RAW image into an editing program such as Lightroom/Aperture, the image is usually worse than if you just took the image as JPEG. Now I understand that the camera does some magic during the JPEG conversion. But I'm trying to understand what that "magic" is.   If I'm looking to implement that "magic" myself on the desktop, what kind of settings should I be trying? I find that the RAW files have more extreme contrast. The dark areas for example are way darker than JPEG. Why is this? And what is the best way to fix this?
49468
I have been taking some photos with my new camera, and have found that once I import them to my laptop, the colors look washed out, and not as nice and vivid as on the camera LCD display.  It's a Sony HX60, and I am importing them into an HP dm4, running Fedora.  I've read about color profiles, and made sure that the calibration on my monitor was set.  The thing is that the issue arises with just importing them from the camera iteself (using Shotwell) and diplaying them with the standard Image Viewer, it's not even an issue with Gimp or an image editor with a color profile not set.  I am wondering if my camera is using some of color profile that is being lost when imported, or is it that the display on my camera is much better than the one my laptop?  I can then open the image in Gimp, and then use some enhancements to make the image look better, but I just want them to look the same as on my camera.  Any ideas?  Update:  Here is an example image I took:   And here is a photo of the comparison of how the Sony HX60 &amp; the HP dm4 render the output. This photo was taken with a cheap Lumix, but still clearly shows the difference:
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I was wondering how to check the value of a pixel at a mouse click in QGIS (as of 2.4).  In ArcGIS, the Identify tool does the job for both rasters and vectors. However, in QGIS, the Identify tool seems to be greyed out when only one raster layer is loaded.
75091
How can I green screen in Photoshop? I am making a picture were I need to green screen, and it would be very helpful if someone could help me!
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I'm wondering what information is contained in an image file like JPEG or PNG.  I know that most of them contain a metadata file, but anything else other than that?  Anything relates to the license key or personal information in there?  Does software like Photoshop hide some user data in an image?
121519
How to exactly convert an arithmetic rgb value (e.g 0.55,0.25,0.1) to the corresponding 8bit RGB value (e.g. 123,90,40)?  My more specific questions are:  1.) What is the exact conversion formula and macro?  2.) Is there some built in command or macro for converting it?