In RAM it occupies 1500x1000x3 bytes (8bit = 1 byte).
The final file size depends on the format in which it is saved on the disk.
An image is made up of pixels, or tiny squares that each have a designated color. the pixels are normally so small that you don't see them. However, sometimes a picture looks blurry when resized. That blurry image is a pixelated image.
When a person refers to image data, they are most likely referring to the internal code of a picture file that tells the computer information it needs to display the image, such as (but not limited to) what color the pixels in an image are, how many pixels an image has, and what image type it is.
The image resolution of a picture is broken into pixels. The amount of pixels in the picture depends on the size of the print. There are approximately 100 pixels per inch in a picture.
detecting the smile in the picture by making the picture into a clarity picture. i.e. by boosting of pixels(decreasing the space between pixels of an image)
The picture will become finer. Your picture is made up of dots called pixels. Pixels are created from resolution for example 640x480=XXXX amounts of pixels. So when you create more pixels by increasing the resolution to say 1024x768=xxxxx amounts of pixels you increase the pixels amount and finess of the image.
You can scale an image to make it larger or smaller, but you can't create pixels out of nothing; if you scale it to have fewer pixels, then you're losing detail, and if you scale it to have more pixels, then you have to guess at the value of the new pixels by averaging nearby pixels. Both of these tend to make the picture look more blurry.
Bitmap image is raster or pixel based image. Bitmap image is made up of pixels, every pixel in grid have its own position and color. Pixels are mapped to the pixel grid, that's why its name is Bitmap.
You are changing the values of one or more pixels. Raster images are composed of pixels, editing them means changing the values of some pixels.
The amount of pixels per picture is just to measure the detail and clarity of a picture. The 30 pixels will give you a clearer crisp picture with more detailed color, whereas the 10 pixel will have a larger botchy picture with no intense small detail.
A raster image is made up of individual pixels (picture elements) often these are square.
Pixels help to make your image show up better on the screen. More pixels = more detail and accuracy, but the screen is a lot smaller then what you will be actually seeing on a print or a computer so it might be a bit off. +++ That first sentence misses it point. "Pixel" comes from "Picture element", i.e. a tiny square fragment of the picture, so pixels do not help the image to show up, they form the image.
Printing a photograph in a newspaper and printing a photograph in an art book will require very different image resolutions. For the newspaper 100 pixels per inch is OK for the art book 600 or more. So if your image is 5 * 8 inches the newspaper picture should be 500 * 800 pixels or 400 000 pixels, the art book greater than 15 million pixels.