Tahuri PNG Tuhinga o mua BMP

Kāore — BMP kāore he kanikani Alpha, nā reira ka whakakotahitia ngā rohe mārama ki tētahi tae papamuri, mā, engari rawa ka hurihia e koe. Ko te mea tino mōrearea i tēnei tahuritanga: he tohu āhua mātao i runga i tētahi pātaka mā, ka tae mai ki tētahi kāwai mā i te taha. Ka whakaritea te tae mārō kia ōrite ki te wāhi e noho ai te whakaahua, ka kōwhiri rānei he ūnga e pupuri ana i te Alpha. He tino nui te BMP — tata ki te 36 MB te nui o te whakaahua 12-megapikē — ā, kāore he kaiwhaiwhai e whakaaro ana ki a ia hei āhua o te Wīwī.

Kāore he raraunga pikitia, kāore. Ko ngā āhuahira e rua e rokiroki ana i te whakaahua me te kore whakawhāiti, kia ōrite ai te whakaahua e puta mai ana ki te mea i whakaurua, ā, ka taea te tāruatanga i te wā kore. Ko te huringa ko te rahi o te faila, ā, ko ngā āhuatanga haere - te hōhonu o te tae, ngā tātuhi whakawhāiti, ngā apa me te whakateretanga e tautokona ana i waenganui i ngā āhuahira kore ngaro. Ka whakamahia e PNG te whakawhāititanga DEFLATE i runga i ngā raina tātari tātari, kia ora ai ia pikitia, tae atu ki tētahi kanikani ā-arawhiti 8-biti. Ko te tikanga kia rokirokitia e BMP i ngā rārangi pikitia kore e whakawhāititia ana me tētahi pūwhakahako iti, nā reira he ngāwari noa iho te tātari.

Ka ora te mārama ina haere ki PNG, WebP, TIFF, GIF, SVG rānei. Ka whakarerekē te tahuri ki JPG i te kanikani ā-autōhiko ki tētahi papamuri mā - mēnā e hiahiatia ana e koe te mārama, ka ūngatia tētahi hanga mārama-mārama i te wāhi o BMP.

Ka whakaakona ngā tātai tae ICC whakawaitara mai i te pūtake PNG, ā, ka hono anō ki te huaputa BMP i reira te āhua e tautoko ana i a ia (JPG, PNG, TIFF, WebP). Ko ngā āhua kāore i te tautoko i te tātai e hoki ana ki te sRGB.

E pupuritia ana te EXIF o te kāmera (ISO, shutter, lens, GPS) mā te pūmau i te wā o te tahuritanga PNG → BMP ina tautokona e ngā āhua rua te metadata. Ka whakamahia te kōwhiringa whaiaro hei whakakore i te metadata i mua i te whakataki mēnā e hiahia ana kia tirohia ngā whakaahua me te kore tauwāhi.

He — ka tangohia e tātau he maha ngā pūranga PNG ki roto i te rohe whakaata, ā, ka whakatūtautautia rātau i te taha kotahi. Ka whiwhi ngā kaiwhakamaori wātea ki te 100MB ia pūranga; Kāore he kōpaka i ia pūranga, ā, ka haere tonu ngā kaimahi ā-tahi, nā reira ka oti te 200-pitanga i raro i te rua minu.

Mō te tahuritanga āhuahira māmā, ka whakarewaina e tātau te pūtautau ōrite libpng / libjpeg-turbo / libwebp / ImageMagick e whakamahia ana e te kaiwhakawhanake papamuri, me te āhuatanga ōrite. Ko te rerekētanga ko ngā utauta papamuri e whakatuwheratia ana i tētahi pūkete i tētahi wā; ka whakaaetia e tātau tētahi rōpū, ā, ka whakarewaina i te āhua kotahi.

Ko te whanonga tōmua ko te 1:1 — he ōrite ngā ahu o ngā pūwhitinga o tōtou BMP ki te pūtake PNG. Ka whakamahia tētahi hipanga /resize-image/ motuhake i muri i te tahuritanga mēnā e hiahiatia ana e koe te whakaiti, te whakawhānui rānei hei wāhanga o te rerenga mahi.

Mō JPG / WebP, ko te āhuatanga 75-85 e whiwhi ana i te pūkete 60-80% iti iho i te pūtake PNG me te kore rerekētanga mārama i te tawhiti tirohia. Mō ngā whāinga kore ngaro (PNG, TIFF), e tūmanako ana kia iti iho te tiakitanga - i te nuinga o te wā 5-30% mā te whakawhāiti pai ake / LZW.

He — e whakarewaina ana ngā pūranga PNG i whakarewaina i roto i ngā kaimahi takitahi, ā, ka tangohia i roto i ngā minu. Kāore anō tātau ki te whakaako, ki te rokiroki, ki te tiritiri rānei i te raraunga pikitia. Ko te kaupapahere whaiaro katoa me te matapihi tautuhi i te /privacy/.

He mea mō te wāteatanga tae noa ki te 100MB. Ka whakahaeretia e te Premium ngā tāuru nui ake (300MB+) me ngā hōhonu-pōtuhi-pōtuhi (16-bit PNG, 32-bit float TIFF). Ka rere te pūtautau i ngā rārangi pōtuaka, nā reira ka tauine te whakamahinga pūmahara ki te tau o te rārangi, ehara i te tau o te pōtuaka katoa.