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Datorizētas attēlu apstrādes pamatprincipi, priekšrocības un trūkumi.

trešdiena, 2009. gada 16. septembris
Tēma "Datorizētas attēlu apstrādes pamatprincipi, priekšrocības un trūkumi..." - jauna tēma skola informātikas kursā, turklāt visai aktuāla šobrīd lietojamo servisu un moderno ierīču piedāvāto iespēju kontekstā (skat. pdf prezentāciju par datorizētu attēlu apstrādi). Fotografē gandrīz vai visi, digitāli iegūto attēlu skaits aug, attēli jāapstrādā, jāuzglabā, jādrukā, jāievieto dokumentos, utml. Skaidrs, ka nepieciešamas arī attiecīgas zināšanas un prasmes datorizētas attēlu apstrādes pielietojumos. Jāpārzina attēlu grafikas veidi, to īpatnības, kā arī datorprogrammas darbam ar attēliem. Uzreiz jāpiebilst, ka attēlu apstrādes programmu ir ļoti daudz, t.s.k bezmaksas.

Noteikti ieteicams iepazīties ar LU sagatavoto materiālu "Datorgrafika" no moduļa "Attēlu apstrādes pamatprincipi". - Atvērt lasīšanai. Noteikti vērts iepazīties arī ar pārējiem moduļa materiāliem!

Par kādiem attēlu grafikas veidiem ir jābūt priekšstatam?
  1. Rastra grafika (punktu grafika) - saite;
  2. Vektorgrafika - saite;
  3. Jauktā grafika;
  4. Fraktāļu grafika - saite;
  5. ASCII grafika (pseidografika) - saite;
  6. 3D grafika - skat. šajā materiālā, Wikipedia, HowStuffWorks, Wolfram vizualizācijas, vai šeit.
Prezentācija ievadam datorgrafikā:


Daži materiāli zināšanu paplašināšanai un padziļināšanai:

Uzdevumi:
  1. Ar meklētāja palīdzību atrast dažus klipkopu (vektorgrafika) attēlus (ClipArt), nodublēt to uz MS Paint vai citu rastra grafikas programmu (PhotoFiltre, PWPaint, ...).
  2. Rastra grafikas programmā mainīt attēlu izmērus dažādos veidos - palielināt, samazināt, pie kam dažados mērogos un vērot attēla izmaiņas (attēla graudainību, krāsu maiņu, asumu, utml.).
  3. Meklētājā atrastos klipkopu attēlus nodublēt kādā vektorgrafikas programmā, piemēram, OpenOffice.org Draw un atkārtot 2.punktā minētās darbības.
  4. Līdzīgas darbības izpildīt arī ar fotoattēliem (rastra grafika).
  5. OpenOffice.org Draw izveidot kādu grafisko objektu ar zīmēšanas rīku joslas palīdzību, to iekrāsot (vēlams ar Gradient tipa aizpildījumu), tad mainīt izmērus iespējami plašās robežās un vērot, vai ilustrācijas kvalitāte mainās. Ko var teikt par šādiem vektrografikas objektiem?
  6. Kādi ir secinājumi? Ko varat secināt par rastra attēliem, ko par vektorgafikas attēliem?
  7. Rezultātus apkopot tabulā, kura līdzīga zemāk dotajai (tabulu var dublēt uz kādu teksta programmu)!
-->
Attēls
Programma
Palielināšana
Samazināšana
Kvalitāte
Graudainība
Klipkopa
MSPaint




OO Draw




Foto
MSPaint




OO Draw





Veiksmi meklējumos, eksperimentos un varbūt kāds no Jums kļūs par datorgrafikas fanu un augstas klases speciālistu!

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