Why save jpg to TIFF changes the number of unique colors?

I have photoshop cs2, when I save a jpg to TIFF file using default (LZW, Interleaved, with IBM PC byte order), I discovered the tif number of unique colors are distinguished by the jpg.

You can test it with this jpg image:
https://CDN.theatlantic.com/assets/media/IMG/Mt/2015/06/rbow-1/lead_960.jpg?1435518405

If you check the jpg with the IrfanView image viewer, the number of unique color is 272662, while it is saved as tiff with photoshop cs2, the number of colors unique to the tiff file is 247160, then the number is increased from the original jpg. But sometimes, in the other case of file jpg, the number is increased. If you zoom in the tiff image, you can see that clearly some parts are like having shift artifact, or color. However if I save the jpg to tiff using IrfanView (using the default option), the number of colors unique remains same (272662).

I also found the same problem when I save the file in jpg to TIFF using microsoft paint (I use windows 7), the number of unique colors result tiff = 272802.

So my questions, represents changes in County of normal color in PS CS2?

Or is it wrong that I should avoid recording for tiff with PS CS2?

Can someone explain what's happened here?

Thanks in advance.

Colors never change when recording in TIFF format. Colors have already been changed when the JPEG format was opened. The TIFF record is irrelevant.

Tags: Photoshop

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