Printer ki grayscale aur "asli" grayscale ek cheez nahi
Kisi puri colorful PDF ko black-and-white printer par bhejo, woh print toh hogi — lekin hamesha achhe se nahi. Printer driver apne hisaab se turant color hatata hai, aur printer ke hisaab se yeh contrast kharab kar sakta hai, milte-julte colors ko ek jaisi dhundhli gray mein badal sakta hai, ya halke color wale pages par bhi zyada toner kharch kar sakta hai. Yeh aksar colorful chart wali presentations mein dikhta hai, jahan do saaf alag dikhne wale chart colors print hote hi ek jaise lagne lagte hain.
Print karne se pehle khud grayscale mein badal lena — printer ko yeh decide karne dene ke bajaye — ek tay, reliable result deta hai, aur kaagaz-toner kharch karne se pehle hi aap dekh sakte hain ki black-and-white version kaisa dikhega.
Sahi grayscale formula kyun matter karta hai
Har grayscale conversion ek jaisa nahi hota. Ek simple tarika har pixel ke red, green aur blue color ka barabar average nikalta hai — lekin insaani aankh brightness ko aise nahi dekhti. Ek jaisi intensity par green color humein blue se zyada bright lagta hai, isliye professional tools ek weighted formula (lagbhag 30% red, 59% green, 11% blue) use karte hain, simple average ke bajaye — jisse result asal mein utna hi alag-alag bright dikhta hai jitna colorful version mein dikhta tha.
Yeh wahi formula hai jo broadcast television aur standard image-editing software dashakon se use kar rahe hain — yeh koi random choice nahi, balki soch-samajh kar liya gaya decision hai.
Convert karne se pehle jaan lene layak trade-off
Is tarike se grayscale mein badalna har page ko image mein render karke uska color hatata hai, jiska matlab hai ki result ab select ya search hone layak text nahi rehta — yeh page ki ek picture ban jaata hai. Jis document ko aap bas print karke file karne wale hain, uske liye yeh koi farak nahi dalta. Lekin jis document mein kisi aur ko digitally text search ya copy karna ho, wahan yeh matter karta hai — uske liye asli colorful PDF alag se rakhein, aur sirf printing ke kaam ke liye grayscale version banaye.
Ek fayda yeh bhi hai ki grayscale images mostly colorful images se thodi better compress hoti hain, toh converted file often thodi choti bhi ho jaati hai, halanki yeh tool ka main purpose nahi, bas ek side benefit hai.