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    The Images

    { Posted on Jun 07 2012 by seoman }
    Categories : news area

    Red Dog

    A studio shot on a plain white background that was originally intended to be a cut-out vignette half tone. The large area of plain white and the soft shadow to the right are challenges for the JPEG format because any compression artefacts will start to show up there first.

    The restricted palette makes low bit-depth GIF or PNG a possibility and allows the background to be transparent although the file size will be larger than with JPEG.

    The image shown is a 6-bit (64 colour) GIF with a transparent (white) background.

    Red Dog – GIF format, 6-bit (64 colours), dithered

    Fireworks

    18.53k

    Ignite

    15.31k

    PaintShop Pro

    15.48k

    PhotoGIF

    18.60k

    Photoshop

    15.67k

    ProJPEG

    n/a

    SmartSaver Pro

    16.02k

    Red Dog – PNG format, 6-bit (64 colours), dithered

    Fireworks

    16.93k

    Ignite

    14.71k

    PaintShop Pro

    18.16k

    PhotoGIF

    n/a

    Photoshop

    19.32k

    ProJPEG

    n/a

    SmartSaver Pro

    19.63k

    Tunisian Port

    A full tone photograph with lots of fine detail in the masts and rigging. Although there is a predominance of blue in the shot, allowing a restricted palette to be used, the JPEG gives format better results than the other two and at about half the file size.

    The sky and clouds are the most difficult areas for both JPEG and dithered GIFs and PNGs.

    Tunisian Port – JPEG format

    Fireworks

    11.76k

    Ignite

    11.95k

    PaintShop Pro

    11.95k

    PhotoGIF

    n/a

    Photoshop

    11.93k

    ProJPEG

    11.95k

    SmartSaver Pro

    12.51k

    Sun Arch

    A very stylised photograph that I originally used as a posterised illustration. The large areas of flat colour make the choice between a JPEG and GIF or PNG more difficult.

    The JPEG version was slightly smaller than the other two but required a low degree of compression to keep the flat areas from going blotchy.

    Sun Arch – JPEG format

    Fireworks

    13.27k

    Ignite

    16.07k

    PaintShop Pro

    13.49k

    PhotoGIF

    n/a

    Photoshop

    15.89k

    ProJPEG

    n/a

    SmartSaver Pro

    16.76k

    Big Deal

    This image is well suited to low bit-depth GIF or PNG. If saved as a JPEG, even the lowest compression displays artefacts on the sharp edges and requires a file that is three times bigger than it needs to be.

    Big Deal – GIF format, 4-bit (16 colours), not dithered

    Fireworks

    3.16k

    Ignite

    2.97k

    PaintShop Pro

    2.98k

    PhotoGIF

    3.18k

    Photoshop

    3.08k

    ProJPEG

    n/a

    SmartSaver Pro

    2.99k

    Big Deal – PNG format, 4-bit (16 colours), not dithered

    Fireworks

    2.85k

    Ignite

    2.45k

    PaintShop Pro

    2.52k

    PhotoGIF

    n/a

    Photoshop

    3.72k

    ProJPEG

    n/a

    SmartSaver Pro

    2.86k

    Simple Headline

    This is the type of image that works best in GIF format. With only one foreground colour and one background colour plus the anti-aliased fringe, it only needs 3 bits (8 colours) and gives a very small file size.

    Note that these graphs are at a larger scale than all the others.

    Simple Headline – GIF format, 3-bit (8 colours), not dithered

    Fireworks

    .91k

    Ignite

    .81k

    PaintShop Pro

    .89k

    PhotoGIF

    .88k

    Photoshop

    .84k

    ProJPEG

    n/a

    SmartSaver Pro

    .87k

    Simple Headline – PNG format, 4-bit (16 colours), not dithered

    Fireworks

    .88k

    Ignite

    .81k

    PaintShop Pro

    .78k

    PhotoGIF

    n/a

    Photoshop

    1.22k

    ProJPEG

    n/a

    SmartSaver Pro

    .91k

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