This dialog box shows the Canvas Size. How to get a size of this folders?
If you want to see just the size of the folder, when you select it with the Rectangular Marquee Tool, Photoshop will show the dimensions of the selection in the lower right as you draw (before releasing the mouse).
After you've made the selection and released the mouse, you can also view the width (W) and height (H) in the Properties panel (Window > Properties).
The Properties panel shows the size without transparent pixels.
Thanks for all.
Thease two foders are in my Windows Explorer. You can notice red folder size is bigger than the yellow folder but pixel value is higher number in yellow folder. I am seraching for that reson. All these icons are downloaded and required images are placed embeded .
I'm guessing that the pixel density of the red folder is greater than the yellow folder. Go to Image > Image Size... and see not only what the dimension are for Width and Height but also what the Resolution is in Pixels/Inch (PPI).