increase jpg size and keep quality?

Discussion in 'other software & services' started by acr1965, Jul 13, 2014.

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  1. acr1965

    acr1965 Registered Member

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    I have saw heard of these software programs that claim their software can keep the quality of a pphot as the size increases. Is there any recommended program that can do this? I'm not expecting miracles but would like to increase a photo about 75% in size while keeping most of the original quality as possible.
    thanks for any info
     
  2. SouthPark

    SouthPark Registered Member

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  3. acr1965

    acr1965 Registered Member

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  4. J_L

    J_L Registered Member

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  5. moontan

    moontan Registered Member

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    keep in mind that JPEG is a lossy compression format.
    so every time you process a JPEG, then save it as a JPEG, compression artifacts creep in.

    if possible, it's always preferable to use a non-compressed format, especially if it's something artistic.

    one of the best software to increase image size is PhotoZoom, but it's not cheap.
     
  6. Robin A.

    Robin A. Registered Member

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    I think it´s not possible to increase the size of an image and keep the quality. To increase the size, it´s necessary to add new pixels, which are calculated (interpolated) from the existing ones. The quality of the result depends on the algorithms used, but it´s always lower that the original. Some programs allow the user to try different algorithms and compare the results.
     
  7. acr1965

    acr1965 Registered Member

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  8. Victek

    Victek Registered Member

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    Yes, the OP might want to convert to lossless TIFF as a first step (if the image resizer supports it).

    Also regarding JPGs some programs have a compression Vs quality slider.
     
  9. jpcummins

    jpcummins Registered Member

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    SouthPark suggested Image Analyzer (free) did you try this program and if so what did you think of it? Thanks!

    John
     
  10. acr1965

    acr1965 Registered Member

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    I have not yet tried the one suggested by SouthPark. If I try it I will let you know the results.
     
  11. SouthPark

    SouthPark Registered Member

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    I find that Image Anlyzer works best using the Wiener filter with m=4 for resizing, up to about 150% if the original was of sufficient quality.
     
  12. acr1965

    acr1965 Registered Member

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    I converted to TIFF then used Image Analyzer with the Wiener filter (150%) and it was the best final picture of all I tried. These are all very good freeware programs. Thanks for all the help and suggestions to everyone.
     
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