Graphics

Guetzli - Perceptual JPEG encoder (english)

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Official information https://github.com/google/guetzli Announcing Guetzli: A New Open Source JPEG Encoder https://research.googleblog.com/2017/03/announcing-guetzli-new-open-source-jpeg.html Guetzli: Perceptually Guided JPEG Encoder https://arxiv.org/abs/1703.04421v1 Users prefer Guetzli JPEG over same-sized libjpeg https://arxiv.org/abs/1703.04416v1 Introduction Guetzli is a chicken race technology that degrades JPEG image data until it is unlikely that people will perceive perceptually. Butteraugli is used for the evaluation instead of human eyes. Although it often sees MSE, PNSR, SSIM in the paper of image processing, these are pretty good estimates, Butteraugli has human visual characteristics (for example, luminance and color tone are different indicators, color tone is the color difference axis of opposite color theory). Read More...

Guetzli - Perceptual JPEG encoder

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公式情報 https://github.com/google/guetzli Announcing Guetzli: A New Open Source JPEG Encoder https://research.googleblog.com/2017/03/announcing-guetzli-new-open-source-jpeg.html Guetzli: Perceptually Guided JPEG Encoder https://arxiv.org/abs/1703.04421v1 Users prefer Guetzli JPEG over same-sized libjpeg https://arxiv.org/abs/1703.04416v1 はじめに Guetzli は知覚的(Perceptual)に人間が見ても分からないだろうギリギリまで Read More...

ImageMagick で画像を比較する

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ImageMagick で画像を比較する もうサムネイルで泣かないための ImageMagick ノウハウ集 http://blog.cybozu.io/entry/2016/01/06/080000 サムネイル周りに何か修正を入れたら修正前後の画像を比較しましょう。 機械によるバ Read More...

ImageMagick でサムネール画像生成

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ImageMagick でサムネール画像生成 初めて ImageMagick でサムネール画像を作成する人向けの簡単な紹介です。 ImageMagick の convert コマンドでリサイズするのに色んなオプションがあって、自 Read More...