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Tehnica fotografica

This topic is about Tehnica fotografica, the author, Mircea104901, wrote about: QUOTE (Watcher Jun 12 2009, 1213 PM) Legat de ISO: depinde mult de subiect si ce faci cu poza mai departe. Sunt de acord ca la aparatele moderne ISO80 ... To read more just scroll down

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Mircea104901
post Jun 12 2009, 06:01 PM
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QUOTE (Watcher @ Jun 12 2009, 12:13 PM) *
Legat de ISO: depinde mult de subiect si ce faci cu poza mai departe.
Sunt de acord ca la aparatele moderne ISO800 e perfect ok.

Uite poza facuta la ISO 3200:


pentru web/print 10x15 la 10MPx merge lejer ISO3200. Daca ai peste 15MPx... merge print si mai mare. (Evident cu NR:On, pe Standard; sau RAW)

Un plug-in(PS)/standalone bun pentru "curatat" zgomotul: Neat Image.

@Azazel uite un link . Mie mi-a fost de "foarte" folos biggrin.gif

This post has been edited by Mircea104901: Jun 12 2009, 06:03 PM


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OvidiuH
post Jun 12 2009, 08:55 PM
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QUOTE (Watcher @ Jun 12 2009, 06:13 PM) *
Legat de ISO: depinde mult de subiect si ce faci cu poza mai departe.
Sunt de acord ca la aparatele moderne ISO800 e perfect ok.

Eu am vorbit strict de fotografia de eveniment.
Uite ISO 12.800 pe D700 -> http://www.flickr.com/photos/digited/3229954153/


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22nst
post Jun 12 2009, 09:22 PM
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Pai daca e asa... ba a mea e mai mare tongue.gif

Uite 5D MK 2 ISO 25600 biggrin.gif
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T u d o r
post Jun 14 2009, 05:23 PM
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Am deschis acest topic si am mutat in el ultima discutie purtata pe "Fotografie pe bune" legata de tehnici de fotografiere.

Cred ca acest topic este util atat incepatorilor (ca mine sau Azazel) cat si celor cu higher skills in aceasta frumoasa arta. Enjoy! smile.gif


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AZAZEL
post Jul 30 2009, 02:06 PM
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cum faceti voi ca la fotografiile deja salvate in computer sa mai adaugati ceva lumina?


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Watcher
post Jul 30 2009, 02:51 PM
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Photoshop of course :-)


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vio
post Jul 30 2009, 04:29 PM
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CITAT(AZAZEL @ Jul 30 2009, 02:06 PM) *
cum faceti voi ca la fotografiile deja salvate in computer sa mai adaugati ceva lumina?




softul cu care ai luat aparatul ... e cel mai recomandat .. cel putin de inceput


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Mircea104901
post Jul 30 2009, 04:38 PM
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QUOTE (AZAZEL @ Jul 30 2009, 08:06 AM) *
cum faceti voi ca la fotografiile deja salvate in computer sa mai adaugati ceva lumina?


Cam cu orice soft de editare foto se ppt ajusta parametrii: brightness(luminozitate) si contrast (contrast). In afara de asta , cu rezultate mult mai bune pentru a ajusta o fotografie subexpusa,(dar necesita cunostinte ceva mai avansate) se folosesc: curves si levels.

Pentru Photoshop, exista plug-in-uri care usureaza corectarea fotografiilor subexpuse.

Un manual si ceva tutoriale: http://rapidshare.com/files/171944814/Phot...d_tutorials.rar


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T u d o r
post Jul 30 2009, 05:38 PM
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De regula aparatul meu tinde sa supraexpuna.

http://www.picnik.com/ asta e un site simplu de folosit pentru corectari, crop, chestii simple.


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Watcher
post Jul 30 2009, 06:26 PM
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Tudore, sa supraexpui e bine.
Daca nu arzi bucati mari de poza, supraexpunerea e recomandata.


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T u d o r
post Jul 31 2009, 12:27 AM
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Posibil Watcher, dar eu cam toate pozele pe care cred ca merita sa le pastrez le subexpun putin din softuri. Nu prea imi place sa fie supraexpuse, unele vad ca au nevoie altele nu. Chestie de gusturi cred. smile.gif


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OvidiuH
post Jul 31 2009, 01:20 AM
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QUOTE (AZAZEL @ Jul 30 2009, 03:06 PM) *
cum faceti voi ca la fotografiile deja salvate in computer sa mai adaugati ceva lumina?

Dacã pozezi raw, e cel mai simplu sã te joci apoi cu luminozitatea imaginii.


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Mircea104901
post Aug 5 2009, 07:15 PM
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O carte nu chiar noua, dar cu informatii utile si exemplificate:

How To Do Everything with Your Digital Camera

This post has been edited by Mircea104901: Aug 5 2009, 07:16 PM


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Watcher
post Aug 6 2009, 01:35 PM
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Tudor, supraexpus (in sensul articolului) nu inseamna 'sters'. Pentru ca ulterior cresti frumos contrastul cat iti trebuie, dar ai mai multa informatie pe care o folosesti pentru a obtine gradienti 'smooth' atat tot.
Toate pozele pe care le vezi publicate de mine sunt 'supraexpuse' si nu e niciuna stearsa, nu? tongue.gif


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Mircea104901
post Aug 6 2009, 02:05 PM
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QUOTE (Watcher @ Aug 6 2009, 07:35 AM) *
Tudor, supraexpus (in sensul articolului) nu inseamna 'sters'. Pentru ca ulterior cresti frumos contrastul cat iti trebuie, dar ai mai multa informatie pe care o folosesti pentru a obtine gradienti 'smooth' atat tot.
Toate pozele pe care le vezi publicate de mine sunt 'supraexpuse' si nu e niciuna stearsa, nu? tongue.gif


Daca "tragi" in RAW, e ok sa supraexpui un pic. Detaliile aparent pierdute in zona supraexpusa se pot recupera.
Dar, daca supraexpui in .jpg, e cam nasol, pt. ca zona supraexpusa nu are detalii, e doar o "pata alba", si nu mai poti recupera detaliile, oricat te-ai stradui. Daca o subexpui (pana la 1-stop e acceptabil; daca e mai mult, apare "zgomotul" in zona de shadows la corectare), la post-procesare nu se pierd detalii; dynamic-range-ul DSLR-urilor moderne permite ca dupa prelucrarea unei poze subexpuse putin (pana la 1-stop) sa nu se observe artefacte.


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Oana
post Aug 6 2009, 10:13 PM
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am si eu niste poze pe care as vrea sa le criticati... le postez aici, pentru ca nu consider ca sunt "fotografii pe bune". nu le-am prelucrat deloc, tocmai ca sa vedeti exact ce am facut
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LE de ce nu stau pozele astea cate 4 pe rand?

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mihaimilk
post Aug 6 2009, 10:56 PM
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ca-s URIAAAASEEEE

ai putea sa le micsorezi un pic
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Mircea104901
post Aug 6 2009, 11:01 PM
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Strict tehnic vorbind, mai putin 1466,1517 si 1562, sunt putin supraexpuse, dar in zone care nu prea deranjeaza.

Folosesti ceva mod automat, care "se descurca", dar ISO il pune cam sus. Ar trebui sa-l controlezi manual si sa-l tii pana la ISO 400 (am vazut ca la iso 800 -poza 0484 e cam "soft" si are un pic de zgomot).
O sugestie: sa dai o compensare la expunere de -1/3 sau -2/3, pentru a evita supraexpunerea. Sau, la "Gain control", scoate "Low gain up".

Daca vrei sa storci mai multa expresie de la poze, de ex. la 1466, ar trebui sa controlezi diafragma manual. Daca foloseai un f4 sau f5.6, si nu lasai aparatul sa puna f13, aveai un background mai "blurry", separai mai bine planta. Sa nu zic ce ar fi facut un filtru de polarizare smile.gif , pe care oricum ti-l recomand, pt. ca vad ca faci poze la plante, padure, stanci (natura).


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T u d o r
post Aug 6 2009, 11:36 PM
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A propos de filtre, stie cineva beneficiile diferitelor filtre, eventual cu ceva exemplificari cu imagini? Recunosc ca habar n-am despre ele, cu exceptia filtrului de protectie UV (si mecanica) pe care il folosesc.

Oana, pozele sa le pui te rog la Fotografie pe bune, si eu tot acolo imi postez incercarile. Lasa ca ne facem noi mari. smile.gif


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HalbaSus
post Aug 7 2009, 09:24 AM
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Eu unul am folosit doar filtru de polarizare circulara. Ce face ? Foarte simplu, pune-ti ochelarii de soare, uita-te la un peisaj, apoi da-i jos si uita-te la acelasi peisaj fara ochelari de soare... vezi diferenta ? ehhh... acelasi lucru il face si filtrul de polarizare circulara.
Sunt niste "ochelari de soare" pentru obiectiv, bine acum asta a fost o explicatie simplista, ideea e ca un filtru de polarizare circulara elimina reflexiile (ma rog, mare parte din reflexii, nu si cele metalice), face culorile mai puternice, cerul mai albastru, etc...
Este sin singurul filtru al carui efect nu se poate imita in photoshop (ma rog, se poate incerca dar nu va fi la fel), restul filtrelor modifica tonul de culoare, incalzesc sau racesc culorile, etc... dar recomandarea mea (mai ales pentru amatori) este sa foloseasca photoshopul pentru a replica efectele filtrelor. Nu de alta dar in momentul "tragerii" trebuie sa fii atent la suficiente lucruri (compozitie, focus, expunere, white-balance, etc...) si un filtru nu ar face decat sa te incurce. Cand deja toate celelalte iti vin in mod natural atunci un filtru poate fi util. Eu recunosc ca inca nu am ajuns la stadiul ala.

Oana, singura poza pe care am remarcat-o a fost cea cu vasele de lut (sau ce erau ele), compozitia e buna, expunerea e buna, e OK. De asemenea poza 1 (cea cu cainele in miscare) are potential dar: nu esti suficient de aproape de subiect, practic subiectul nu acopera nici un sfert din cadru, nu e suficient de sharp, subiectul nu este separat de background, faptul ca se vede si coltul cladirii nu ajuta deloc, ideal era sa prinzi patrupedul cu un background uniform (iarba).


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