I have more then two gigabytes of travel photography. Each image takes up than 4 to 5 megabytes. I have to send them to some one. How can I resize all images while retaining high image quality?
Answer
As is often the case, "there is no free lunch".
JPEG is the de-facto standard image format, and uses lossy compression. That means that to get smaller file sizes, you will lose image quality. The only question is how much you lose, and whether that loss is acceptable.
That said, there are lossless compression techniques that are used by other formats (tiff and png are most common). With these formats, it is possible to reduce the file size without losing quality, but it is rare to achieve the same level of compression as with a lossy format.
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