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Thread: the shape of your pics

  1. #1
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    the shape of your pics

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    I thought I should repost this so that more people are mindful of the various shapes in common use… I have come across too many secretaries (and engineers for that matter) who simply drag to resize pictures and who don't seem to notice that the picture is “out-of-shape”

    …and as they say, a picture is worth a thousand words…

    do note that the rectangles are to scale, except if you are viewing this on a 1280×1024 display

    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona · crumenatum · Galleria Botanica

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    what about the print size papers?

    4R, 8R etc

    heh

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    any one knowledgeable about photopaper format care to comment?
    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona · crumenatum · Galleria Botanica

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    Code:
           Photo       Print              Resolution
           Size         Size
           3R             3.5 x 5.0       800 x 600    
           4R             4.0 x 6.0       900 x 600    
           5R             5.0 x 7.0       1024 x 768    
           6R             6.0 x 8.0       1280 x 1024    
           8R             8.0 x 10.0      1600 x 1200    
           8RS            8.0 x 12.0      1600 x 1200    
           10R            10.0 x 12.0     1800 x 1500    
           11R            11.0 x 14.0     1800 x 1500    
           12R            12.0 x 16.0     2400 x 1800    
           12RS           12.0 x 18.0     2400 x 1800    
           Pararoma       12.0 x 4.0      1800 x 600    
           Passport       1.4 x 1.8       640 x 480

  5. #5
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    One of the main difference is that the earlier pic shows the "shape" or aspect ratio of the various formats, it does not dictate the size.

    The ‘R’ photographic print sizes specifies a size but does not specify a resolution (used to be analog), and the aspect ratio is not constant:
    • 3R = 1.43
    • 4R = 1.50
    • 5R = 1.40
    • 6R = 1.33
    • 8R = 1.25
    • 10R = 1.20


    Simon, are those resolutions the recommended digital resolution? Do note that if the pictures will be skewed if stretched to fill the paper e.g. 800×600 stretched to 4R will be "out-of-shape".
    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona · crumenatum · Galleria Botanica

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    Choy,

    The info. happen to be from a Photo Imaging Center

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    Re:

    I think the resolution spec. is not correct.

    Usually, I don't scale an image to the correct aspect ratio, and definitely would look a bit distorted. Either we crop it or work on the extra space border. If I know the final scale of the end results, it'll be better to start with that dimension instead.

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    Re:

    [quote:66a281d9dd="hwchoy"]
    Simon, are those resolutions the recommended digital resolution? Do note that if the pictures will be skewed if stretched to fill the paper e.g. 800×600 stretched to 4R will be "out-of-shape".[/quote:66a281d9dd]
    I think those are the recommended minimum resolution (~140 dpi, more dpi for smaller size, less dpi for bigger size), for each size to produce reasonably sharp print out.

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    Re:

    [quote:d628aeb61b="naturetan"]I think the resolution spec. is not correct.
    [/quote:d628aeb61b]erm, which spec are you referring to?

    [quote:d628aeb61b="naturetan"]
    Usually, I don't scale an image to the correct aspect ratio, and definitely would look a bit distorted. Either we crop it or work on the extra space border. If I know the final scale of the end results, it'll be better to start with that dimension instead.[/quote:d628aeb61b]

    Precisely, you should never scale an image from one format (let's say 3/2) to another (e.g. 4/3) which will cause distortion. The problem is many people appear (to me at least) to be oblivious to this distortion.

    Specifically for our aquaristics photography, I would recommend shooting at the highest resolution possible with your cam, and to shoot RAW if supported. Shooting at maximum resolution assures the capture of maximum amount of information. When you crop the image around the subject, there may still be enough resolution to blow up the image if needed. This is especially true with tiny fishes like Boraras.
    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona · crumenatum · Galleria Botanica

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    Re:

    [quote:319e5fc998="hwchoy"]erm, which spec are you referring to?[/quote:319e5fc998]
    The resolution spec from Photo Imaging Center.

    The term resolution used by them is misleading for this case. Don't think they really understand what's really the meaning of it. As you've mentioned, 800X600 will cause a distortion if printed on 3R, unless we print it without scaling but with border space.
    Even that, 800X600 is not enough for 3R printing, interpolation will result and quality will not be the best.

    [quote:319e5fc998="Gan CW"]I think those are the recommended minimum resolution (~140 dpi, more dpi for smaller size, less dpi for bigger size), for each size to produce reasonably sharp print out.[/quote:319e5fc998]
    Not that true. Depending on your quality of print, for reasonably good one, it's better to get at 300dpi. 140dpi is a bit low and its OK if printing for newsletter. The value is constant whether small or large print.

  11. #11
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    800 x 600 = 4/3 ratio.


    Photo Print Resolution
    Size Size
    3R 3.5 x 5.0 800 x 600

    makes no sense: 800x600 = 4/3 ratio, 5.0/3.5 = 10/7 ratio
    I think the 800x600 means the minimum resolution from which they will scale down and crop.

    going by print size:

    Photo Print Ratio
    Size Size
    3R 3.5 x 5.0 10/7
    4R 4.0 x 6.0 3/2
    5R 5.0 x 7.0 7/5
    6R 6.0 x 8.0 4/3
    8R 8.0 x 10.0 5/4
    8RS 8.0 x 12.0 3/2
    10R 10.0 x 12.0 6/5
    11R 11.0 x 14.0 14/11
    12R 12.0 x 16.0 4/3
    12RS 12.0 x 18.0 3/2
    Pararoma 12.0 x 4.0 1/4
    Passport 1.4 x 1.8 9/7

  12. #12
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    when you bring your JPEG files to the developer do they resize and/or crop? or do they just print the whole image?

    If they do not crop, then it is important to get the JPEG in the right "shape" first. It does not matter how many pixel as long as the aspect ratio is correct. So if we wanted an image printed on 3R we should
    • first crop (NOT resize!) the image to a 10/7 aspect ratio, e.g. 1000×700, 1500×1050, etc.
    • then resize with the same % amount on x and y axis to obtain the required DPI (actually the shop should be able to do this automatically)


    so if you want 600dpi on 3R you would have an image resized to 3000×2100.
    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona · crumenatum · Galleria Botanica

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    as long as you give them in the correct resolution.. they will print as given, unless you tell them what you what to change (saturation, border & etc)

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    Re:

    [quote:b3f277035e="Simon"]as long as you give them in the correct resolution.. they will print as given, unless you tell them what you what to change (saturation, border & etc)[/quote:b3f277035e]

    which means there is a high chance lots of people are getting their prints printed (slightly) out-of-shape ? well, most people can't tell anyway :P
    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona · crumenatum · Galleria Botanica

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    choy, I think you should ask those people in CS... from what i get reading the related threads... the developer should print it as it is... no out of shape/improportion

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    I'll bring along my photo album which have some photos that I printed from FotoHub for you guys to "analyze". I thought it was quite ok.

    Cheers,
    I have dwarf cichlids in my tanks! Do you?

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    well if we can shoot a pic of geometrical objects, circle, square, etc then have it printed, the you will know for sure whether they are "out-of-shape" lor.
    why I don't do garden hybrids and aquarium strains: natural species is a history of Nature, while hybrids are just the whims of Man.
    hexazona · crumenatum · Galleria Botanica

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    Re:

    [quote:101e493aef="Simon"]
    Code:
           Photo       Print              Resolution
           Size         Size
            8R             8.0 x 10.0      1600 x 1200    
           8RS            8.0 x 12.0      1600 x 1200
    [/quote:101e493aef]Most of the good printer shop will probably do the cropping for you, if I'm not wrong. Take a look at the above quote size of 8R and 8RS. Theses sizes are proportionally different, but their spec for "resolution" is the same. So will they scale it or crop it?

    Some of those professional lab provide customised printing services so that I can more or less control the output I wanted.

    If you played with film photography, you'll also realised that cropping is done on different scale size of printing. This can sometime be quite frustrating if the compostion of the image turn out to be rather tight, where inappropriate cropping is done. Sometimes, I might have to ask for a reprint if it's way out.

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