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The colour space of a photo, is nearly always not the same as the colour space of a photograph.

What's the difference between a "photo" and a "photograph"?

> The word ‘photo’ comes from the Greek word for light.

> A photo may also be referred to as a ‘photograph’, this is a combination of the Greek words for light and drawing; A photograph is a drawing made of light.

Source https://shuttermuse.com/glossary/photo/

According to Wikipedia the two words mean the same thing:

https://en.m.wikipedia.org/wiki/Photograph

Photo seems to be the more popular version lately which is hardly surprising:

https://books.google.com/ngrams/graph?content=photo%2Cphotog...

Trying to assume as much good faith in the original comment, GP may have been talking about the difference between the original photo and the resulting published jpeg file.

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