Size of the image in relation to the size

I'm just trying to get my head around the size of the image in relation to the size and an answer to my question can resolve once and for all!    Save a jpg file, I say 1000 pixels wide and 100 ppi 10 quality of file.  But if I save the file even to 1000 pixels wide and back to 100 ppi but this time to the quality 5 - What is happening in the file?   I have the same number of pixels in the picture, but what actually makes the quality slider?

Thank you very much

Sue

The size of the image and the JPEG quality are not the same thing.

Resizing of an image without "resampling" will only change the size of the dimension compared to the size of resolution, but not the size of the overall picture. In other words, you end up with an image low resolution greater or a small image high resolution. But the number of pixels remains the same.  Although pixels can be more or less important, the pixel and data remain the same. However, when you resample an image it affects (based on interpolation methods) actual pixel data.

When you save a file in JPEG format, you use a lossy compression encoding format (i.e., the lower the setting, the image of several data are removed in favour of a reduced file size). It has really nothing to do with the pixel size, but rather of pixel information. This compression method is based on the algorithms of compression JPEG data, interpolation and pixel. If you do not want to lose any information data and then use the level of highest quality available (12) when you save your files. Or alternatively, save it in a format like TIFF, EPS or PSD lossless. However, at least two formats are generally larger and may not be recognized by applications or PCs. DSP is a proprietary format of Photoshop and although she uses compression methods it is not generally considered lossy.

The cursor in the JPEG dialog box examines essentially given in pixels and neighbors of pixels when you apply the size of compression rather than pixel (or size).

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