[Question]: jpegtran, MozJPEG optimizers

[rela589n]

Hi there!

I'd like to ask about imagor's available image optimization options.

In Thumbor there's particular feature that's available - jpegtran optimizer.
I haven't tested it myself, but currently I seek for a tool that besides the rest of the functions would allow image size optimization and that's why I ask if there's native support from imagor, since I haven't found any mention in the README?

Also, I see that there's -vips-mozjpeg option that enables MozJPEG compression. Is it natively bundled in the docker image, or is it necessary to build a custom docker image to have this option available?

FWIK, mozjpeg seems to do a better compression, while taking more time compared to jpegtran. If possible, I would really appreciate it if you could share from your own experience what size reduction we could expect from these image optimizers.

Thank you

[cshum]

If MozJPEG is being complied on host machine, -vips-mozjpeg would enable MozJPEG compression. Other it would be no effect.

MozJPEG is currently not bundled with docker image, due the default libjpeg-turbo being used by many other dependencies, and we have yet to make it work alongside with other dependencies.
https://github.com/cshum/imagor/blob/master/Dockerfile

However if anyone manages to make MozJPEG complie successfully alongside all the other dependencies within the Docker image, I am all for a PR.

[rela589n]

Got it,

Thank you!

[skurfuerst]

@cshum Hey,

keep up the great work :) The attached Dockerfile installs Imagor with MozJPEG for me; leading to quite a lot smaller JPEG files as expected :)

All the best,
Sebastian

# https://github.com/cshum/imagor/blob/master/Dockerfile
ARG GOLANG_VERSION=1.25.1
FROM golang:${GOLANG_VERSION}-trixie as builder

ARG VIPS_VERSION=8.17.2
ARG TARGETARCH
ARG ENABLE_MAGICK=false

ARG MOZJPEG_VERSION=4.1.1
ARG MOZJPEG_URL=https://github.com/mozilla/mozjpeg/archive


ENV PKG_CONFIG_PATH=/usr/local/lib/pkgconfig

ADD ${MOZJPEG_URL}/v${MOZJPEG_VERSION}.tar.gz /tmp/
WORKDIR /tmp


RUN DEBIAN_FRONTEND=noninteractive \
  apt-get update && \
  apt-get install --no-install-recommends -y  build-essential libboost-all-dev pkg-config  autoconf automake libtool nasm make cmake flex

RUN DEBIAN_FRONTEND=noninteractive \
  apt-get install --no-install-recommends -y  libpng-tools libpng-dev zlib1g-dev

RUN tar xf v${MOZJPEG_VERSION}.tar.gz \
  && cd mozjpeg-${MOZJPEG_VERSION} \
  && cmake -G"Unix Makefiles" . \
  && make -j4 \
  && make install \
  && cp jpegint.h /usr/include/jpegint.h \
  && cd .. \
  && rm -rf mozjpeg


# Installs libvips + required libraries + conditionally ImageMagick
RUN DEBIAN_FRONTEND=noninteractive \
  apt-get update && \
  apt-get install --no-install-recommends -y \
  ca-certificates \
  automake build-essential curl \
  meson ninja-build pkg-config \
  gobject-introspection gtk-doc-tools libglib2.0-dev libjpeg62-turbo-dev libpng-dev \
  libwebp-dev libtiff-dev libexif-dev libxml2-dev libpoppler-glib-dev \
  swig libpango1.0-dev libmatio-dev libopenslide-dev libcfitsio-dev libopenjp2-7-dev liblcms2-dev \
  libgsf-1-dev libfftw3-dev liborc-0.4-dev librsvg2-dev libimagequant-dev libaom-dev \
  libspng-dev libcgif-dev libheif-dev libheif-plugin-x265 libheif-plugin-aomenc libjxl-dev libavif-dev && \
  if [ "$ENABLE_MAGICK" = "true" ]; then \
    apt-get install --no-install-recommends -y libmagickwand-dev; \
  fi && \
  cd /tmp && \
    export PKG_CONFIG_PATH=/opt/mozjpeg/lib64/pkgconfig/ && \
    curl -fsSLO https://github.com/libvips/libvips/releases/download/v${VIPS_VERSION}/vips-${VIPS_VERSION}.tar.xz && \
    tar xf vips-${VIPS_VERSION}.tar.xz && \
    cd vips-${VIPS_VERSION} && \
    meson setup _build \
    --buildtype=release \
    --strip \
    --prefix=/usr/local \
    --libdir=lib \
    -Dmagick=$(if [ "$ENABLE_MAGICK" = "true" ]; then echo "enabled"; else echo "disabled"; fi) \
    -Djpeg-xl=enabled \
    -Dintrospection=disabled && \
    ninja -C _build && \
    ninja -C _build install && \
  ldconfig && \
  rm -rf /usr/local/lib/libvips-cpp.* && \
  rm -rf /usr/local/lib/*.a && \
  rm -rf /usr/local/lib/*.la

ENV PKG_CONFIG_PATH=/opt/mozjpeg/lib64/pkgconfig/ \
    LD_LIBRARY_PATH=/opt/mozjpeg/lib64

WORKDIR ${GOPATH}/src/github.com/cshum/imagor


RUN git clone https://github.com/cshum/imagor .
RUN go mod download


RUN go build -o ${GOPATH}/bin/imagor ./cmd/imagor/main.go

FROM debian:trixie-slim as runtime
LABEL maintainer="adrian@cshum.com"

ARG ENABLE_MAGICK=false

COPY --from=builder /usr/local/lib /usr/local/lib
COPY --from=builder /etc/ssl/certs /etc/ssl/certs
COPY --from=builder /opt/mozjpeg /opt/mozjpeg

ENV PKG_CONFIG_PATH=/opt/mozjpeg/lib64/pkgconfig/ \
    LD_LIBRARY_PATH=/opt/mozjpeg/lib64

# Install runtime dependencies including conditionally ImageMagick
RUN DEBIAN_FRONTEND=noninteractive \
  apt-get update && \
  apt-get install --no-install-recommends -y \
  procps curl libglib2.0-0 libjpeg62-turbo libpng16-16 libopenexr-3-1-30 \
  libwebp7 libwebpmux3 libwebpdemux2 libtiff6 libexif12 libxml2 libpoppler-glib8t64 \
  libpango-1.0-0 libmatio13 libopenslide0 libopenjp2-7 libjemalloc2 \
  libgsf-1-114 libfftw3-bin liborc-0.4-0 librsvg2-2 libcfitsio10t64 libimagequant0 libaom3 \
  libspng0 libcgif0 libheif1 libheif-plugin-x265 libheif-plugin-aomenc libjxl0.11 && \
  if [ "$ENABLE_MAGICK" = "true" ]; then \
    apt-get install --no-install-recommends -y libmagickwand-7.q16-10; \
  fi && \
  ln -s /usr/lib/$(uname -m)-linux-gnu/libjemalloc.so.2 /usr/local/lib/libjemalloc.so && \
  apt-get autoremove -y && \
  apt-get autoclean && \
  apt-get clean && \
  rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

COPY --from=builder /go/bin/imagor /usr/local/bin/imagor

ENV VIPS_WARNING=0
ENV MALLOC_ARENA_MAX=2
ENV LD_PRELOAD=/usr/local/lib/libjemalloc.so

ENV PORT 8000

# use unprivileged user
USER nobody

ENTRYPOINT ["/usr/local/bin/imagor"]

EXPOSE ${PORT}

[cshum]

@skurfuerst I am trying to build a mozjpeg variant of imagor docker image:

docker pull ghcr.io/cshum/imagor-mozjpeg:docker-variants

https://github.com/cshum/imagor/pkgs/container/imagor-mozjpeg

Would you please help to check if this docker image has mozjpeg properly installed?

(during testing only amd64 is available, as arm64 is taking too long to build)

[skurfuerst]

I will try out tonight and give feedback :)

[skurfuerst]

@cshum Yeah, confirmed, quite some impressive size improvements with your built image from ghcr.io/cshum/imagor-mozjpeg:docker-variants and VIPS_MOZJPEG: 1

see this table for details:

vendor/bin/testbench  imagor:benchmark-image-sizes
+---------------------+--------+------------+----------+
| version             | format | dimensions | size     | without mozjpeg (from above)
+---------------------+--------+------------+----------+
| original            | jpeg   | orig       | 6.3 MB   |
| optimized_no_change | jpeg   | orig       | 2.5 MB   | 3.7 MB (32.4% bigger)
| optimized_quality95 | jpeg   | orig       | 10.6 MB  | 13.8 MB (23.2% bigger)
| optimized_quality80 | jpeg   | orig       | 3.1 MB   | 4.3 MB (27.9% bigger)
| optimized_quality50 | jpeg   | orig       | 1.5 MB   | 2.5 MB (40.0% bigger)
| optimized_no_change | jpeg   | 600x600    | 35.9 KB  | 44.3 KB (19.0% bigger)
| optimized_quality95 | jpeg   | 600x600    | 152.2 KB | 161.9 KB (6.0% bigger)
| optimized_quality80 | jpeg   | 600x600    | 42.8 KB  | 50.8 KB (15.7% bigger)
| optimized_quality50 | jpeg   | 600x600    | 22.1 KB  | 29.7 KB (25.6% bigger)
| optimized_no_change | webp   | orig       | 1.5 MB   |
| optimized_quality95 | webp   | orig       | 6.2 MB   |
| optimized_quality80 | webp   | orig       | 1.9 MB   |
| optimized_quality50 | webp   | orig       | 1.1 MB   |
| optimized_no_change | webp   | 600x600    | 28.6 KB  |
| optimized_quality95 | webp   | 600x600    | 97.4 KB  |
| optimized_quality80 | webp   | 600x600    | 35.6 KB  |
| optimized_quality50 | webp   | 600x600    | 20.5 KB  |
+---------------------+--------+------------+----------+

[cshum]

The MozJPEG variant of Imagor Docker image is now available at v1.5.18
https://github.com/cshum/imagor#mozjpeg-support