Mai Juyawa PSD zuwa BMP

An yi musu tace, na daɗaɗɗa, cikin wani hoton haɗe-haɗe guda. An yi wa moɗa na haɗe-haɗe, maskara, layuka na daidaitawa da rubutun da za'a iya gyarawa duka gyara zuwa pixels na ƙarshe saboda BMP ba ta da wani tsari da za'a riƙe su. Ka riƙe PSD kamar mai aiki kuma ka yi wa BMP aiki kamar wani fitarwa. PSD yana riƙe da duk wani shawara na gyara mai sakewa, wanda shi ne dalilin da ya sa shi ne babban siffar don aikin zane wanda za'a sake shi. BMP yana da girma — hoton megapixel 12 yana da girman MB 36 — kuma babu mai bincike da zai iya kula da shi kamar wani siffar yanar gizo mai hankali.

Haƙĩƙa — BMP ba ta da wani gidan rediyon alfa, don haka yankuna masu haske ana haɗa su da launin bango, fari sai ka canza shi. Wannan shi ne abin mamaki mafi yawan gaske a cikin wannan canji: wata alamar da ta yi kama da kyau a kan wata fuskar fuska mai duhu tana zuwa tare da wani akwatin fari a kusa da ita. Ka ƙayyade launin matsi don ya haɗu da inda kowane hoton zai zauna, ko kuma ka zaɓa wani mataki da zai riƙe alfa.

An canja shi zuwa sRGB, saboda BMP ba shi da yanayin CMYK. Don amfanin fuskar kwamfyuta wannan shi ne abin da kake so. Don bugawa na kasuwanci ba shi da haka — canjin gamut na canza yadda launuka masu zafi ke sakewa a kan bugawa, don haka aika da marufin da asali PSD maimakon BMP.

Ba da bayanai game da piksel, ba. Nau'ukan biyu suna adana hoton ba tare da ƙuntata ba, don haka hoton da ke fitowa yana daidai da wanda ya shiga kuma ana iya sake canzawa ba da daɗewa ba. Abin da ke canzawa shine girman fayil, da kuma abin da ke tafiyar da fasali - zurfin launin, siffofin da aka rufe, layuka da motsi ana goyon baya su duka ba daidai ba tsakanin nau'ukan da ba su da asara.

Haske zai ci gaba idan BMP ya kasance PNG, WebP, TIFF, GIF, ko SVG. Canja zuwa JPG zai sauya layin alfa zuwa bango mai fari. Idan kana buƙatar haske a cikin sakamakon, to, ka yi niyya ga BMP mai haske mai sani a matsayin BMP=JPG. BMP shine Windows Bitmap, format ɗin raster na ƙanƙanta wanda aka ƙera cikin Windows tun daga 1985.

An karanta siffofin launin ICC da aka rufe daga PSD kuma an sake haɗa su zuwa fitarwa BMP inda siffar ke goyon baya (JPG, PNG, TIFF, WebP). Siffofin da ba su da goyon bayan siffar suna komawa zuwa sRGB, wanda ke kiyaye launuka daidai a kan mafi yawan fuskokin nunawa na zamani.

An kiyaye EXIF na kamara (ISO, shutter, lens, GPS coords) bisa diff yayin PSD → BMP idan nau'ikan biyu suna goyon bayan metadata. Yi amfani da zaɓin sirri don cire metadata kafin sauke idan kana buƙatar raba hotuna ba tare da wurin geolokaci ba.

Na'am — ka ja fayiloli PSD da yawa cikin yankin shigarwa kuma mu sanya su cikin jerin gwano a daidai. Masu amfani da kyauta suna samun 100 MB ga kowace fayil; Premium ba ta da iyaka ga kowace fayil kuma tana tafiyar da wasu masu aiki a daidai, don haka wani bangare na hotuna 200 na iya kammala cikin minti biyu.

Domin canja siffar kai tsaye muna tafiyar da irin libpng / libjpeg-turbo / libwebp / ImageMagick da mai sarrafa kwamfyutan tebur ke amfani da shi, tare da ingancin fitarwa guda. bambancin shine sarrafa kwasfa mai daidaituwa — shiri-shiri na kwamfyutan tebur suna buɗe fayil ɗaya a lokaci; muna karɓar kwasfa.

Diff ɗin shi ne 1:1 — BMP ɗinka na riƙe da girman piksel na wurin asali PSD. Idan kana buƙatar canza girman kamar wani ɓangare na canja wurin, ka yi amfani da /resize-image/ bayan canja wurin, ko kuma ka haɗa shi da kayan aikin /image-resize/.

Ga JPG / WebP, inganci 75-85 na iya samun BMP 60-80% mafi ƙaranci daga PSD ba tare da bambanci mai gani ba a tsayin gani na yau da kullum. Ga BMP mara asara (PNG, TIFF), ka yi tsammanin adadin da za'a iya adana ya fi ƙaranci — a kan 5-30% ta hanyar ficewa / LZW mai kyau. BMP ba ta bukata wata ɗakin karatun decoder ba a gaba ɗaya, don haka tana da matsayin format na musanya mai aminci ga tsarin da aka rufe da kuma kayan aikin Windows na baya.