Final answer:
The step 'ranging' is not required to transform an analog image into a digital image. The necessary steps for this transformation include sampling, scanning, and quantization.
Step-by-step explanation:
The process of transforming an analog image into a digital image involves several key steps. However, among the options provided, 'ranging' does not fit in as a necessary step. The correct steps typically required are:
- Sampling: This is where the analog signal (in this case, the image) is measured at regular intervals to capture its intensity or color levels.
- Scanning: During this step, the image is digitally captured using a scanner, effectively converting the spatial elements of the image into a digital form.
- Quantization: This refers to the process of mapping the sampled values to a finite set of levels, which are represented digitally with a certain number of bits.
Sampling, scanning, and quantization are all essential to the digitization process, while 'ranging' is not a recognized step in this context.