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2. Mat (picture framing) - Wikipedia

   en.wikipedia.org/wiki/Mat_(picture_framing)

   While some say that acidic framing materials should be avoided for all but the most temporary frames, it is not safe to say that all "acid-free" mats are recommended for long term preservation use. The hierarchy of mat board quality is as follows: Museum board – The highest quality material available. It is constructed of 100% cotton fiber ...

3. Picture frame - Wikipedia

   en.wikipedia.org/wiki/Picture_frame

   View of a frame-maker's workshop, oil on canvas, circa 1900 The elaborate decoration on this frame may be made by adhering molded plaster pieces to the wood base.. A picture frame is a container that borders the perimeter of a picture, and is used for the protection, display, and visual appreciation of objects and imagery such as photographs, canvas paintings, drawings and prints, posters ...

4. Photographic composition - Wikipedia

   en.wikipedia.org/wiki/Photographic_composition

   Photographic composition techniques are used to set up the elements of a picture. These are the techniques which resembles the way we humans normally see a view Some of the main techniques that are:

5. National pipe thread - Wikipedia

   en.wikipedia.org/wiki/National_pipe_thread

   The sealants, where used, are typically thread seal tape thread sealant or a thread seal paste pipe dope (sometimes similar in composition to plumber's putty). Because the thread body is tapered (0.75 in/ft or 62.5 mm/m), a larger diameter keeps compressing into a smaller diameter and finally forms a seal (no clearance remains between the ...

6. Headroom (photographic framing) - Wikipedia

   en.wikipedia.org/.../Headroom_(photographic_framing)

   [7] The rule of thirds suggests that the subject's eyes, as a centre of interest, are ideally positioned one-third of the way down from the top of the frame. [8] With a subject placed one-third of the way down from the top of the frame, the subject aligns with the proper headroom to make an image pleasing to the eye.

7. Image circle - Wikipedia

   en.wikipedia.org/wiki/Image_circle

   To avoid vignetting, a photographer using a view camera must ensure that the area remains within the image circle (Adams 1980, 56–57; 151–52; 157–61); a tilt/shift lens or perspective-control lens used on a small- or medium-format camera usually has mechanical limitations that keep the frame area within the image circle.