Brightness vs Contrast
Kev ci ntsa iab thiab qhov sib txawv yog ob lub ntsiab lus tseem ceeb uas tau tham hauv thaj chaw ntawm optics, kev yees duab, astronomy, atrophotography, instrumentation, spectroscopy thiab ntau lwm yam. Brightness tuaj yeem txhais tau tias yog qhov cuam tshuam luminance ib qhov los yog ib qho khoom ua rau tus neeg soj ntsuam. Qhov sib txawv tuaj yeem txhais tau hais tias yog xim sib cais ntawm ob xim sib txawv uas tuaj yeem txheeb xyuas tau. Ob lub ntsiab lus no tseem ceeb heev hauv kev nkag siab ntau qhov chaw uas muaj kev siv cov ntsiab lus no. Nws yog ib qho tseem ceeb kom muaj kev nkag siab zoo hauv cov ntsiab lus no kom ua tau zoo hauv cov haujlwm xws li kev yees duab thiab kho qhov muag. Hauv tsab xov xwm no, peb yuav tham txog qhov ci ntsa iab thiab qhov sib txawv yog dab tsi, lawv cov ntawv thov, qhov zoo sib xws ntawm qhov ci thiab qhov sib txawv, cov ntsiab lus ntawm qhov ci thiab qhov sib txawv, qhov tseem ceeb ntawm lub cev ntawm qhov ci thiab qhov sib txawv, thiab thaum kawg sib piv qhov ci thiab qhov sib txawv thiab qhia qhov txawv. ntawm ob leeg.
Brightness
Brightness yog ib qho tseem ceeb heev uas tau tham txog hauv kev yees duab thiab astronomy. Hauv kev yees duab, ci ntsa iab yog cov nyhuv luminance tsim los ntawm lub teeb los yog lub teeb pom kev. Brightness yog qhov pom kev pom uas ua rau tus neeg saib xyuas lossis tus saib pom cov duab zoo li ci lossis tsaus. Lub teeb ci lossis lub teeb pom kev zoo yog suav tias yog qhov chaw ci ntsa iab thaum lub teeb absorbing nto yog hu ua tsaus.
Qhov ci ntsa iab feem ntau suav nrog siv RGB nplai. RGB nplai, uas sawv cev rau Liab, Ntsuab, Xiav nplai, yog qhov chaw xim peb sab uas muaj xim twg tuaj yeem suav nrog siv R, G, thiab B qhov tseem ceeb ntawm cov xim. Lub brightness, feem ntau denominated siv lub cim µ, yog quantified as
µ=(R + B + G) / 3, qhov twg R, G, thiab B yog cov txiaj ntsig Liab, Ntsuab thiab Xiav.
Hauv astronomy, ci ntsa iab tau muab faib ua ob hom. Pom meej qhov loj yog qhov ci ntawm lub hnub qub pom los ntawm qhov chaw muab. Qhov loj kawg nkaus yog qhov ci ntawm lub hnub qub pom los ntawm 10 parsecs (32.62 lub teeb xyoo).
Kev sib tw
Kev sib piv yog cov cuab yeej ntawm ib qho khoom lossis kev sawv cev ntawm ib qho khoom hauv cov duab uas ua rau nws yooj yim rau kev paub qhov txawv ntawm lwm tus. Cov qualities yog luminance thiab xim ntawm cov khoom. Nyob rau hauv lub neej tiag tiag, qhov sib txawv yog txheeb xyuas raws li qhov ci thiab xim ntawm cov khoom txiav txim siab nrog rau lwm yam khoom hauv qhov kev pom. Qhov sib txawv yog ib qho tseem ceeb heev uas siv rau hauv kev paub txog tus cwj pwm optical. Cov duab uas muaj qhov sib txawv siab pom tau yooj yim dua li cov uas tsis sib xws.
Muaj ob peb txoj hauv kev los ntsuas qhov sib piv. Qhov sib txawv ntawm Weber txhais tau tias yog (I-Ib) / Ib, qhov twg kuv yog qhov pom ntawm cov khoom thiab kuv byog qhov luminance ntawm keeb kwm yav dhau.
Qhov txawv ntawm Brightness thiab Contrast yog dab tsi?
