URGENT! Exam in 3 hours!! (bitmaps)?

Question

When a bitmap image is increased, do the size of the pixels increase, or what happens so that its quality obviously lessens?

Thanks!

Thanks, but different answers from everyone! Is someone clear up what actually happens? :)

Answer 1

Your question isn't very clear, so neither are the answers. What do you mean by "increased"?

If you mean viewing at increased magnification, then, yes, the pixel size increases. At large magnifications, the pixels themselves become quite obvious, and the image appears "pixelated" - composed of little squares of color.

If you re-scale the picture to a larger size (i.e. higher pixel count) in an image-processing program, the software generally attempts to interpolate between pixels, so you get a smooth blend, rather than jagged pixels. However, this process can't add detail, it just sort of smears the image from one pixel to the next, so if you look closely the image looks unsharp or blurry.

Answer 2

pixels never increase nor decrease in size unless the screen resolution is changed as mentioned by someone.
When your image is increased in size, the program has to color in the missing pixels by using adjacent colors.

A concrete example will make things clearer:

- suppose u have a line of pixels let's say 10x1 pixels alternating black and white.
bwbwbwbwbw

- now suppose u want to enlarge the line to 20x1 pixels. This will leave some blanks.
b w b w b w b w b w

- so the computer fills in the blanks with existing adjacent colors as such.
bb ww bb ww bb ww bb ww bb ww (the spaces are just there so that yahoo answer doesn't cut off the string, but I think u get the idea)

Well this is not bad when it's in one dimension with 2 colors.
But imagine this happening in 2 dimensions and with shades of every color. It will be pretty hard to determine what color goes where.
When you double the image size, some programs can handle it OK by doing some calculations to fill in the blank. But what if u blow it up 3 or 4 times? The pixel in the middle is already an approximation, and doing some approxiation over an approximation is only going to give place to more errors, and that's why the more u blow up the picture, the worst the quality.

Answer 3

When the bitmap image increases, the pixel size actually decrease. So, for example, you have a 480 x 600 compared to a 1024 x 1200 .bmp files, the smaller resolution will have a larger size, but lower quality. The 2nd res size results into a clearer picture and much smaller pixel sizes while decreasing the actual size.

Answer 4

When you increase the size of your Bitmap image, the computer adds these additional pixels to fill the required space. The computer attempts to do this by looking at the existing pixels already in the image. With a square block of colour this would be easy, however with a complicated picture it doesn't do such a good job and the end result is often blurred.

Answer 5

You can't increase the size of a pixel unless you are changing display resolution. You can use multiple pixels to represent the color information from one pixel. Doing so makes the image quality lower. The result is commonly referred to as pixelated.

Answer 6

Yes, the size of the pixels increase therefore the image does not keep the same resolution.

Answer 7

bitmap images can lose detail when scaled on-screen since they are resolution-dependent, they contain a fixed number of pixels and each pixel is assigned a specific location and color.

Answer 8

the pixels are duplicated