Tahuri TIFF Tuhinga o mua JPG

Ka whakatatatia rātau, i te wā katoa, ki roto i tētahi whakaahua whāiti. Ko ngā tikanga whakakotahi, ngā mīhini, ngā apa whakahōu me te kupu whakahōu katoa e whakamātautia ana ki ngā pītaki whakamutunga nā te mea kāore he hanganga a JPG hei pupuri i a rātau. Whakataki te TIFF hei matua mahi me te JPG hei whakanaotanga. E whakahaeretia ana e TIFF a CMYK, te hōhonutanga 16-biti, ngā tātai ICC whakawātea me ngā tuhinga pāpāho maha, ko te mea tika e hiahiatia ana e te tātuhi me ngā rerenga mahi pūranga. Kāore he mārama a JPG, ka whakapeka anō i ia wā ka tiakina, ā, ka whakaputaina i te ātetetanga mārama i runga i te tae mārama me te kupu mārama.

Kāore — JPG 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.

I te āhuatanga 80-85 kāore e kitea te rerekētanga i te tawhiti tirohia noa iho, ā, ko te nuinga o te wā ka whakapeka te faila e 60-80%. Ko te ātete he huarahi kotahi: ko te tiaki i te JPG anō i te wā kotahi e whakakotahi ana i ngā ahanoa. Whakataki te TIFF hei matua, ā, ka whakahōu anō te JPG mai i tēnei i te wā e hiahiatia ana e koe he rahi hōu. He ngaro te JPG: ka hurihia te whakaahua ki tētahi DCT, he nui, he waehere entropi, me te kāwae āhuatanga e whakahaere ana i te nui e whakawāteatia ana.

E whakawhirinaki ana, ā, i te wāhi e noho ai te ūnga ki te whakatakoto i a ia - te tauira kāmera, ngā whakaritenga whakakite, te tītara me ngā taururuku GPS katoa e whakawhiti ana. Ko GPS te āpure e whakaaro ana: mēnā ka whakaputaina te whakaahua, ka whakamahia te kōwhiringa metadata-strip kia kore ai e whakapāpāho i te wāhi i hoatu ai te whakaahua. Ko TIFF te Rerekētanga Reketere Pikitia i te tau kotahi mano e 1986, ā, ko te āhua o te karapa, te whakaputanga, me ngā umanga tātari i whakawaengatia.

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 JPG.

Ka whakaakona ngā tātai tae ICC whakawaitara mai i te pūtake TIFF, ā, ka hono anō ki te huaputa JPG 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 TIFF → JPG 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 TIFF 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 JPG ki te pūtake TIFF. 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 TIFF 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.