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Having made the selection of the required part, hit Enter to have undesired (unselected) part of the image cropped off permanently. As soon as you will hit the Enter Key, undesired part of the image will be deleted permanently and another symbol indicating the step of cropping of the image will be appeared inside the History Palette right beneath the first symbol according to the picture below.

Symbol named Crop has been appeared inside the History Palette

In the History Palette you can see the record of all  variations made in the image from it’s opening in Photoshop to the changes made in it by the use of dialogue box named Brightness/Contrast . In case, Photoshop starts to run sluggishly during further work, you can purge this record to restore its previous speed by getting inside the Edit Menu and selecting the option named Purge. As soon as you will select the option Purge given inside the Edit Menu, there will be appeared a side menu containing four options including Undo, Clipboard, Histories and All as I have explained earlier. As here you are supposed to purge the record regarding Histories, so select the option named Histories by clicking on it. 

Sub options of the command named Purge including Histories

As soon as you will select the option referred as Histories given inside the menu of Purge, there will be appeared a small dialogue box named Adobe Photoshop. In that dialogue box there will be seen nothing but a question “This cannot be undone. Continue ?” and two buttons named OK and Cancel. All you need to do here is to hit the button named OK to purge Histories.

Click OK to purge Histories

As soon as you will hit that button , the dialogue box named Adobe Photoshop will be vanished from the sight along with the record of different variations made in the document from the History Palette save from the last one (in this case the record of Brightness/Contrast) according to the picture below. 

Record regarding histories has been purged

So that is how you can purge Histories to make Photoshop run faster. I hope this post will be proved helpful to all my readers. If you want to put forward any question, complain or suggestion for further improvement kindly don't forget to subscribe your comments.

As I have explained in my earlier posts that it is very easy to transform a colored picture into black and white using Desaturate command. When we apply Desaturate command on any image, there is left no need to change the color mode of that image (whether it be a CMYK image or RGB or Lab image) into Grayscale to transform it into black and white.  All we need to do  is to get inside the Image Menu and select the option referred as Adjustment. As soon as we select that option, there is appeared a side menu containing various options regarding image Adjustment. Out of those options we are supposed to select nothing but Desaturate to discard all the color information out of that image. So that is how we can transform any image into black and white. For further detail see my post Functionality of Desaturate in Photoshop.

As in Photoshop, we work on layers , so there is a possibility that we apply Desaturate command on some layers while at the same time keep rest of the layers fully colored. Sometime , in order to render unique and awesome look to different images, we add some color in some parts of a desaturated image.  Apart from the addition of entirely different color from the one image contained before being desaturated, we can bring back precisely the same color image has lost after being desaturated.

As  far as the addition of entirely different color in any part of a desaturated image is concerned, we can do so either by using adjustment command named Hue/Saturation (I intend to explain in my oncoming post) or adjustment layer named Hue/Saturation (I have explained in my earlier post Desaturate command & Adjustment layer named Hue/Saturation). But whenever it comes to bring back the  lost color information in any part of a desaturated image,  we can either apply History Brush Tool in that part of the image or we can use the method of Layer Masks.  In this post I have decided to explain the use of History Brush Tool  in order to bring back the lost color information in any part of a desaturated image ,and as far as the other method  (use of Layer Mask) is concerned, I intend to explain it later.

First of all open your required image (preferably 8-bits RGB)  in Photoshop. In case your required image is not an 8-bits RGB image (for instance it might be a 16-bits CMYK or 8-bits CMYK or 16-bits RGB or 8-bits Lab or 16-bits Lab image), you can transform it into  8-bits RGB quiet easily. In order to transform any image into 8-bits RGB all you need to do is to get inside the Image Menu and select the option named Mode. As soon as you will select that option, there will be appeared another menu containing different options regarding Modes. Out of those options , you are supposed to select two options referred as  8-bits Channel and RGBby putting checks beside these options according to the picture below.

 Having changed the color mode of the image into 8-bits RGB,  the next thing which is supposed to be done right after that is the creation of  a duplicate of the locked background layer that contains our image so that we could keep the  original image perfectly intact while make changes in the duplicate of it.  In order to create a duplicate of that layer, hit CTRL + J on the keyboard.  As soon as you will do so, there will be appeared another thumbnail in the layer palette indicating newly created duplicate of the locked background layer according to the picture below.

Two identical thumbnails is the layer palette showing two identical layers

Then , in order to transform that colored duplicate of the locked background layer into black and white, just get inside the Image Menuand select the option named Adjustment. As soon as you will select  the option referred as Adjustment given inside the Image Menu of Photoshop, there will be appeared another menu containing a host of other options.  Out of those options, select Desaturate either by clicking on it or by hitting CTRL + Shift + U on the keyboard.

Various commands inside the side menu of Adjustment along with Desaturate

As soon as you will click on the option named Desaturate given inside the side menu of Adjustment or hit CTRL + Shift +U on the keyboard, the colored picture on the selected layer will turn into back and white according to the picture below.

Duplicate layer after being desaturated

If you want to keep  the desaturated  form of the image perfectly intact too in the same document along with the original form of it, hit CTRL + J on the keyboard one more time (this time to create a duplicate of layer 1 that contains our desaturated image). As soon as you will do so, there will be appeared another thumbnail in the layer palette right above the thumbnail that is representing layer 1, indicating newly created duplicated of layer 1 according to the picture below.

Duplicate of the desaturated layer in the layer palette

Then, in order to bring back precisely the same color in any part of the image that image has lost after being desaturated, we need to select History Brush Tool. So, select History Brush Tool by clicking on it in the tool panel.

History Brush Tool in the tool panel

As soon as you will select that tool, the setting options for the History Brush Tool will be appeared in  the option bar  and the pointer of your mouse will assume the shape of the currently selected brush in the option bar. In order to select appropriate brush type you need to open brush picker menu. For that purpose, click the small arrow that can be seen beside the currently selected brush in the option bar.

Option bar for History Brush Tool

 As soon as you will click that arrow, there will be appeared a Brush Picker menu containing a good number of options regarding brush types, sizes and styles.  Out of the options given inside the Brush Picker menu , select a soft round brush of any size as at this stage, size of the brush doesn't matter at all and we can change it later according to our need either by hitting } (to increase the size of the brush) or { (to decrease the size of the  brush).  Right beside the arrow that is supposed to be clicked to open Brush Picker menu, you can see a drop down menu referred as Painting Mode. Out of the different options given inside the menu named Painting Mode, select the option Normal and set the Opacity and Flow for the strokes of the brush equals to 100% each according to the picture below.

Select a soft and round brush of any size, select Normal as Painting Mode, and set Opacity and Flow equals to 100% each

After that, in order to make your work easier, zoom the picture in by hitting CTRL + + on the keyboard. Having zoomed the picture in, put the pointer of your mouse on any part of the duplicate desaturated layer (e.g. on apples), keep the left button of your mouse pressed and start to paint upon that part of the image by dragging your mouse. Each stroke of the brush will cause the restoration of the lost color in that part of the image according to the picture below.

For your convenience you can increase or decrease the size of the brush simply by hitting } (to increase the size of the brush) or { (to decrease the size of the brush) as I have explained earlier.
So that is how you can restore the lost color information in a destaurated image and give it a unique look using History Brush Tool.

Image with a look totally different from it's original aspect

I hope all my readers will find this post help,interesting and easy to understand at the same time. If so , kindly let me aware of that by subscribing your comments.


Related Posts

Functionality of Desaturate in Photoshop
Desaturate command & Adjustment layer named Hue/Saturation

Desaturate is a command that sucks all the colors out of a colored picture and makes it look like a Grayscale image. In order to find this command you are supposed to get inside the Image Menu and select the option named Adjustment. In the side menu of Adjustment you can find a host of commands along with Desaturate. Though,  desaturated RGB, CMYK and Lab  images look like  Grayscale images but the difference is that you can render awesome look to desaturated images by adding colors in different parts of these images using different tools and commands ( e.g. Brush Tool, History Brush Tool, Hue and Saturation, Fill and Pattern Stamp Tool etc). But as far as the Grayscaleimages are concerned, there is no way to add any color  other than black, white and different shades of gray in those images.

Desaturate makes a colored picture looks like a Grayscale image

In order to understand how this command works follow the instructions given below.

First of all open a colored image, preferably RGB, in Photoshop (as RGB is the most suitable color mode for image editing) according to the picture below.

/Desaturate in the side menu of Adjustment

 As soon as you will do so, the image will turn black and white having lost all the colors according to the picture below.

Image on the locked background layer has been desaturated