Print. Blisters are raised or loose areas of skin in which fluid accumulates under the outer layer. A blister may not be painful at first, but if the outer layer of skinthe epidermisis opened, the sensitive skin underneath can become quite painful and may also get infected.rint. Blisters are raised or loose areas of skin in which fluid accumulates under the outer layer. A blister may not be painful at first, but if the outer layer of skinthe epidermisis opened, the sensitive skin underneath can become quite painful and may also get infected.
SHARPENING: UNSHARP MASK. An unsharp mask is actually used to sharpen an image, contrary to what its name might lead you to believe. Sharpening can help you emphasize texture and detail, and is critical when post-processing most digital images.t turns out that an unsharp mask is actually utilizing a trick performed by our own human visual system. The human eye sees what are called Mach bands at the edges of sharp transitions, named after their discovery by physicist Ernst Mach in the 1860's. These enhance our ability to discern detail at an edge.
You can merge the layers before applying the Unsharp Mask filter. Click the image in the preview window and hold down the mouse to see how the image looks without the sharpening. Drag in the preview window to see different parts of the image, and click + or â to zoom in or out.he Blur tool softens hard edges or reduces detail in an image. The more you paint over an area with the tool, the blurrier it becomes. Select the Blur tool. Do the following in the options bar: 1  Choose a brush tip and set options for the blending mode and strength in the options bar.