Yadda za a yanke, kuma ci images

Wannan ya fito ne azaman aikin dole a cikin kwas ɗin kwanan nan da na koyar daga Microstation da Manifold, a nan na gabatar da taƙaitaccen yadda:

Ina da hoton da aka zazzage daga Google Earth, wanda na ba shi haske kuma ina so in yanke shi bisa ga polygon wanda ke wakiltar fadada kewayen biranen mazaunin mazauna.  Sannan ina so in haɗe shi da grayscale hoton da nake da shi tare da ƙaramin ƙuduri amma cewa su hoto ɗaya ne wanda ke ajiye launuka a gaba.

A wannan yanayin zan yi amfani da Microstation Descartes, wanda yake daidai da AutoCAD Raster Design ko abin da muka sani da Overlay. Idan ba a bayyane kayan aikin Descartes ba, yi "kayan aikin / akwatinan kayan aiki" kuma a can ne za a kunna kwamitin "Descartes Raster Control".

1. Yanke hoton dangane da polygon.

Da zarar na sami polygon, sai na yi amfani da umarnin "corridor images", yana tambayata ga polygon da aka sare, don haka sai na zabe shi ta hanyar latsa siffar rawaya. 
Sa'an nan ta yin na biyu danna wani allo ya bayyana cewa ya tambaye ni:

• wanne daga cikin hotunan tunani nake son yankewa
• da manufa hanya
• image format
• idan ina so in nuna gaskiya ragaggen yanke
• da girman pixel mai fitarwa. 

Ta tsohuwa tana saita girman pixels wanda hoton yana da amma zan iya canza su.

Sannan sakon ya bayyana a kusurwar da kake sarrafawa, kuma hoton ishara ya bayyana a karshen. A sakamakon haka zaka ga cewa an yanke hoton launi, sauran a bayyane saboda in ga hoton grayscale a baya.

2. Ci duka hotuna biyun

  Yanzu abin da nake so shine inyi ɗayan hotuna biyun, don haka sai nayi siffar yankin da nake son haɗewa, da kuma amfani da maɓallin "haɗa hotuna". Yana tambayata daidai da umarnin baya, tare da banbancin cewa a wannan yanayin bana nuna kowane hoto sai dai zaɓi na "matsakaita" don zaɓar duka biyun.

Kuma shirye masu kyau, ga yadda ban mamaki, ya yi hoto da duka biyun.

Ah, don yin wannan, ba a buƙatar samun lasisin Descartes ko Microstation ba, saboda faifan da Bentley ke aikowa idan ka shigar da shafin su a cikin Zaɓin Zaɓin CD ɗin yana ba ka mintina 15 ... abin da na yi ya sa na rasa 11.