![]() ![]() ![]() Without that information the values are meaningless. That is why when someone asks for a document to be in CMYK it is essential to know which CMYK profile. The way in which the values at each pixel represent actual colours is described in the document colour profile. There is no generaic RGB and generic CMYK. There is a third element that needs to be considered and that is the colour profile. It is a specialist mode for HDR (High Dynamic Range) and not needed for normal images. 32 bit/channel is a bit different in that it does extend the range so each value can be darker than the darkest displayed black or whiter than the whitest displayed white. That does not give a larger range, just a larger number of steps across the same range. So in 8 bits/channel there are 256 possible values. The bit depth 8 bit 16 bit or 32 bits/channel is the number of bits used to store each value. In CMYK it is one for Cyan, one for Magenta one for Yellow and one for Black. ![]() In the case of RGB it is a value for Red, one for Green and one for Blue. Of course, if you need both forms of jpg then you need to duplicate again OR use the export panel in bridge to make a small one.The colour mode - RGB or CMYK describes how the colour is stored for each pixel. The ONLY TIME you ever want to us "save for web and devices" is if you are actually going to make an image for facebook, etc. When all done just flatten and save as a jpg. If you have a super shot master file that you want to save just save it first, duplicate it, rename, and do the conversions on it. When at a point that you need the filters that won't work in 16 bit, if you are using prophoto you need to convert the color mode to adobe98 first then convert to 8 bit. For example, an 8-bit RGB image that measures 25 inches by 16.667 inches at 72 ppi measures 6 inches by 4 inches at 300 ppi, but remains 6.18MB in file size. 16 bit has a lot of advantages, particularly if you also set color mode for prophoto, in that you can do a lot of adjustments and still not end up with a spiked histogram. After adjustments in acr you then open in ps so it ends up whatever you set acr for. You could make an action with a keyboard shortcut to save time Export always reduces to 8 bits per channel, because it is intended for web/screen/mobile devices, and 16 bit output normally makes no sense. When the raw file is demosaiced in acr, the options (the link at the bottom in acr) sets whether 8 bit or 16 bit, which color space, and resolution. 1 Correct answer D Fosse Community Expert, Save is your only option. Photoshop CS5 will allow you to select JPEG even if the current image mode is 16bit, CS4 will require the current image mode to be 8bit before you get the option to save. Ooooh forgot to mention this only affects Photoshop CS4 and earlier. It still processes all layers in 16bit and then downconverts the final result. Tim’s Quick Answer: My answer here would be no, in part because it would be necessary to also flatten the master image if you are going to convert it to 8-bit per channel mode. The Save For Web and Devices dialogue has the same effect. If you flatten the image in 16bit, the calculations are done one final time in 16bit and your conversion to 8bit doesn't have any effect since all visible colours in the sRGB gamut can be represented in 8bits. If you process this image in 16bit, and then convert to 8bit, all those calculations done to display your final image revert to 8bit. However on an image with layers, what you see on the screen is the mathematical result of all of the layers you have on the image. This Photoshop tutorial will show you how to convert a 32 or 16 bit image into an 8 bit image to save it as a JPEG. You can do this easily with Also check out the documentation Converts to 8-bit grayscale. There's no calculations going on to display the final image, and it's just showing the layers. By default, conversion to 8-bit uses the min/max values of the brightness / contrast settings when quantizing, meaning that you’ll need to make sure the brightness / contrast for all your channels are the same before doing the conversion. What you see on the screen is what you get. ![]()
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