One of my personal all time favorite tools in Photoshop is the hue saturation controls. It's a very powerful way of adjusting the hue saturation over your entire image or just selected colors. But before I do that, I'm going to adjust my eyedropper tool to make sure that it is selecting from a larger range. Instead of point sample, I'm going to change it to 5x5-pixel average. And with that done, go to the image menu>adjustments>hue/saturation, or command + u on the Mac, or control + 'U' on the PC brings up the hue saturation dialogue box. And like other image adjustment dialogue boxes you can save out any of your adjustments as a particular resource file, which you can load again on a different image to make those exact same adjustments without having to do them manually. So the hue saturation controls allow you to adjust these 3 parameters of your image - the hue, the saturation and the lightness of the image. And you can choose to adjust them globally, if you choose master from the edit pull down menu. Or you can zoom-in on a particular color value such as reds, yellows and so on. At the bottom of our hue saturation dialogue box, we have two color spectrums. The top color spectrum is the source colors and that is the colors in your image, and the bottom one is your adjustments. And to demonstrate that, with my edit pull down list set to master, it means I'll be affecting all the hue and saturation of all the pixels. I'm going to make a simple adjustment here and drag my hue slider a little bit to the right and notice what happens - since all of the pixels are being affected the hue of all of my pixels is shifting. And notice how that shift looks down at the bottom of my spectrum here. And of course we can make a similar type of adjustment to the saturation. If we drag this slider all the way to the right, we'd be increasing the saturation. We can get highly saturated day glow effect by dragging it far to the right, or suck the saturation out of it by dragging it to the left of the zero point. And these values are a %, so if you wish you could simply select the value there and type in your own number. And we could also edit the lightness in the same way. Going to hold down my option key on the Mac or the Alt on the PC, and click reset to zero out any changes. Another nice feature of the hue/saturation controls is as I mentioned, you can zoom-in to particular colors that you want to edit. For instance if we wanted to edit say the reds, notice what Photoshop does is it puts this control band in between our two spectrums. And the way this works is the darker gray area will take 100% of our effect. So whatever change we make will be 100% affected in these values. The lighter gray bands to the outside are buffer colors, and we can edit the extent of any of these by clicking one of the two inner boundary gray markers and dragging it and to restrict the colors to a smaller range. And to the same extent we could also edit the amount of buffer colors that are affected by clicking and dragging on the outer triangles - to increase or decrease the range of colors that are also affected in a buffer type of a manner. When you choose to edit one of these color ranges, notice that we can also take advantage of our eyedropper tool. And I could just go right in to my image and click anywhere to select the colors that I want to edit. So I'm going to click on my cow here, and I'm going to add or expand the range by going down and clicking on the eyedropper tool with a plus next to it and dragging around on the cow again and to make sure that I have as many of these colors selected as I need to. And with that range selected, now I can go ahead and make some edits. Such as change the hue of my cow to match the green grass. I'll click ok, and you can see the final effect. So the hue/saturation just edited those particular colors of my reds. I'll undo that, command + 'Z', and bring the hue/saturation controls up again to show you one more feature available; and that is that we can choose to colorize the entire image. If you click colorize, it will enforce this default hue/saturation on your image. Making it very monochromatic looking. But of course we can change to monochromatic look anyway we wish. Of course by going to the hue slider, and dragging it to change the hue of a monochromatic look, and even control the saturation and brightness values of course. So that's the colorize option. A very powerful tool and of course it will work if you have a selection activated on your image as well.
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