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To me/anyone who has been bludgeoned with years of university/professional-level training, magenta cast like that just looks like a bad scan.
Can you explain what's actually going awry during scanning when magenta cast is happening?
salad-
Generally it's because the profiling is wrong. Each film base is a different colour, and the actual colour dyes from each manufacturer are different.
In a lab like where I worked between my two photography degrees, the machine would correct this automatically because it was built for film, and then it was only fine adjustments to get a good colour cast if people asked for hand finishing. The light source inside was particular to the machine.
Flatbed scanners and other consumer grade scanners rely on basic film profiles (like the Epson software), which do a good job of correcting colours based on programmed settings. However these profiles can't do everything, because the storage, temperature and age of the film will shift the gamut, as will the condition of the chemicals in the lab that processed the film. They are also not often light-tight and use a different type of light and sensor array to traditional lab equipment.
That is all taking for granted that the film used was the correct film for application, that the film had the right colour temperature and a filter was used at the time for differing light conditions during exposure. Digital cameras use AWB to compensate for shifts in colour temperature, and even they can get it wrong. It also takes for granted that you have profiled your monitor.
In short, the answer to your question is because it is a photograph that has neither been taken nor processed and scanned by someone with enough control/experience to compensate for the variables faced with processing film.
Magenta casts just happen, it's a fact of life with bad profiling. You have to make your own profiles when scanning, and finish your photographs properly.
For real fun, do it in a colour darkroom.
pdlouche
To me/anyone who has been bludgeoned with years of university/professional-level training, magenta cast like that just looks like a bad scan.
A colour cast, yea, when stylistic. But that's an orange glow, or cold blues, or bleach bypassed high-contrast. Magenta is home scanner user.
It can work, but often doesn't. Without the magenta you can really bring out the warmth or whatever you want. Grey is grey, red is red, blue is blue. If the white balance is on-point, then you can have the colours really pop.
Anyone who says a magenta cast is good is in denial.