[gimp-help] Fix issue #95 (Export as JPEG)
- From: Julien Hardlin <jhardlin src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gimp-help] Fix issue #95 (Export as JPEG)
- Date: Mon, 28 Oct 2019 17:46:35 +0000 (UTC)
commit add6f8c36458bbb52a1d95e70dd53798bc9f7670
Author: Julien Hardelin <jhardlin orange fr>
Date: Mon Oct 28 18:45:53 2019 +0100
Fix issue #95 (Export as JPEG)
images/C/using/export-jpeg-dialog.png | Bin 23861 -> 63740 bytes
src/using/fileformats.xml | 193 ++++++++++++++++------------------
2 files changed, 89 insertions(+), 104 deletions(-)
---
diff --git a/images/C/using/export-jpeg-dialog.png b/images/C/using/export-jpeg-dialog.png
index 0e07137df..372d09240 100644
Binary files a/images/C/using/export-jpeg-dialog.png and b/images/C/using/export-jpeg-dialog.png differ
diff --git a/src/using/fileformats.xml b/src/using/fileformats.xml
index ddcf989a0..95af6e176 100644
--- a/src/using/fileformats.xml
+++ b/src/using/fileformats.xml
@@ -330,7 +330,38 @@
</listitem>
</varlistentry>
<varlistentry>
- <term>Preview in image window</term>
+ <term>
+ Use quality settings from original image
+ </term>
+ <listitem>
+ <para>
+ If a particular quality setting (or <quote>quantization
+ table</quote>) was attached to the image when it was
+ loaded, then this option allows you to use them instead of
+ the standard ones.
+ </para>
+ <para>
+ If you have only made a few changes to the image, then
+ re-using the same quality setting will give you almost the
+ same quality and file size as the original image. This
+ will minimize the losses caused by the quantization step,
+ compared to what would happen if you used different
+ quality setting.
+ </para>
+ <para>
+ If the quality setting found in the original file are not
+ better than your default quality settings, then the option
+ <quote>Use quality settings from original image</quote>
+ will be available but not enabled. This ensures that you
+ always get at least the minimum quality specified in your
+ defaults. If you did not make major changes to the image
+ and you want to save it using the same quality as the
+ original, then you can do it by enabling this option.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Show preview in image window</term>
<listitem>
<para>
Checking this option causes each change in quality (or any other
@@ -341,7 +372,34 @@
</listitem>
</varlistentry>
<varlistentry>
- <term>Advanced settings</term>
+ <term>Save metadata</term>
+ <listitem>
+ <para>
+ If the image you loaded has Exif, XMP, IPTC metadata, they are
+ preserved, and you can save them or not when exporting to jpeg.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Save thumbnail, Save color profile</term>
+ <listitem>
+ <para>
+ Many applications use the small thumbnail image as a quickly
+ available small preview image.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Comment</term>
+ <listitem>
+ <para>
+ You can edit the comment attached to the image you loaded or write a
+ new one.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Advanced Options</term>
<listitem>
<para>
Some information about the advanced settings:
@@ -358,125 +416,61 @@
</listitem>
</varlistentry>
<varlistentry>
- <term>Progressive</term>
- <listitem>
- <para>
- With this option enabled, the image chunks are
- stored in the file in an order that allows
- progressive image refinement
- during a slow connection web download.
- The progressive option for JPG has the same
- purpose as the interlace option for GIF.
- Unfortunately, the progressive option produces
- slightly larger JPG files (than without the
- progressive option).
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>Save EXIF data</term>
- <listitem>
- <indexterm>
- <primary>EXIF</primary>
- </indexterm>
- <para>
- JPEG files from many digital cameras contain extra
- information, called EXIF data.
- EXIF data provides information about the image such as
- camera make and model, image size, image date, etc.
- Although GIMP uses the <quote>libexif</quote> library to
- read and write EXIF data, the library is not
- automatically packaged with GIMP. If GIMP was built with
- libexif support, then EXIF data is preserved if you open a
- JPEG file, work with the resulting image, and then export
- it as JPEG. The EXIF data is not altered in any way when
- you do this. The EXIF data may indicate things such as
- image creation time and file name, which may no longer be
- correct.
- If GIMP was not built with EXIF support, you can still
- open JPG files containing EXIF data, but the EXIF data
- is ignored, and will not be saved when the resulting image
- is later exported.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>Save thumbnail</term>
+ <term>Smoothing</term>
<listitem>
<para>
- This option lets you save a thumbnail with the image.
- Many applications use the small thumbnail image as
- a quickly available small preview image.
+ JPG compression creates artifacts. By using this option,
+ you can smooth the image when saving, reducing them. But
+ your image becomes somewhat blurred.
</para>
- <note>
- <para>
- This option is present only if <acronym>GIMP</acronym>
- was built with EXIF support.
- </para>
- </note>
</listitem>
</varlistentry>
<varlistentry>
- <term>Save XMP data</term>
+ <term>Use arithmetic coding</term>
<listitem>
<para>
- XMP data is <quote>meta</quote> data about the image;
- it is a competing format with EXIF.
- If you enable this option, the meta data of the image is
- saved in an <acronym>XMP</acronym>-structure within the
- file.
+ <emphasis>Arithmetic encoding</emphasis> is a form of entropy
+ encoding (a lossless data compression scheme) that, since
+ GIMP-2.10 can be used in exporting as JPEG. Images using
+ arithmetic encoding can be 5 - 10 % smaller. But older
+ softwares may have trouble opening these images.
</para>
</listitem>
</varlistentry>
<varlistentry>
- <term>
- Use quality settings from original image
- </term>
+ <term>Use restart markers</term>
<listitem>
<para>
- If a particular quality setting (or <quote>quantization
- table</quote>) was attached to the image when it was
- loaded, then this option allows you to use them instead of
- the standard ones.
- </para>
- <para>
- If you have only made a few changes to the image, then
- re-using the same quality setting will give you almost the
- same quality and file size as the original image. This
- will minimize the losses caused by the quantization step,
- compared to what would happen if you used different
- quality setting.
- </para>
- <para>
- If the quality setting found in the original file are not
- better than your default quality settings, then the option
- <quote>Use quality settings from original image</quote>
- will be available but not enabled. This ensures that you
- always get at least the minimum quality specified in your
- defaults. If you did not make major changes to the image
- and you want to save it using the same quality as the
- original, then you can do it by enabling this option.
+ The image file can include markers which allow the image
+ to be loaded as segments. If a connection is broken while
+ loading the image in a web page,
+ loading can resume from the next marker.
</para>
</listitem>
</varlistentry>
<varlistentry>
- <term>Smoothing</term>
+ <term>Interval (MCU rows)</term>
<listitem>
<para>
- JPG compression creates artifacts. By using this option,
- you can smooth the image when saving, reducing them. But
- your image becomes somewhat blurred.
+ JPEG images are stored as a series of compressed square tiles
+ named MCU (Minimum Coding Unit). You can set the size of these
+ tiles (in pixels).
</para>
</listitem>
</varlistentry>
<varlistentry>
- <term>Restart markers</term>
+ <term>Progressive</term>
<listitem>
<para>
- The image file can include markers which allow the image
- to be loaded as segments. If a connection is broken while
- loading the image in a web page,
- loading can resume from the next marker.
+ With this option enabled, the image chunks are
+ stored in the file in an order that allows
+ progressive image refinement
+ during a slow connection web download.
+ The progressive option for JPG has the same
+ purpose as the interlace option for GIF.
+ Unfortunately, the progressive option produces
+ slightly larger JPG files (than without the
+ progressive option).
</para>
</listitem>
</varlistentry>
@@ -571,15 +565,6 @@
</itemizedlist>
</listitem>
</varlistentry>
- <varlistentry>
- <term>Image comments</term>
- <listitem>
- <para>
- In this text box, you can enter a comment which is
- saved with the image.
- </para>
- </listitem>
- </varlistentry>
</variablelist>
</listitem>
</varlistentry>
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