[gimp-help] Issue #4: explain the various choices in the TIFF dialog
- From: Jacob Boerema <jboerema src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gimp-help] Issue #4: explain the various choices in the TIFF dialog
- Date: Thu, 9 Sep 2021 20:46:02 +0000 (UTC)
commit 0a0f835f3553ab6ce9294727336249699899a49b
Author: Jacob Boerema <jgboerema gmail com>
Date: Thu Sep 9 16:45:26 2021 -0400
Issue #4: explain the various choices in the TIFF dialog
Added a new up to date screenshot of the TIFF export dialog.
Improved the description of existing, and added previously unexplained
export options.
images/C/using/export-tiff-dialog.png | Bin 31304 -> 5652 bytes
src/using/fileformats.xml | 121 +++++++++++++++++++++++++++-------
2 files changed, 99 insertions(+), 22 deletions(-)
---
diff --git a/images/C/using/export-tiff-dialog.png b/images/C/using/export-tiff-dialog.png
index c70b1dcb5..47efbd844 100644
Binary files a/images/C/using/export-tiff-dialog.png and b/images/C/using/export-tiff-dialog.png differ
diff --git a/src/using/fileformats.xml b/src/using/fileformats.xml
index 6abc29176..fe7e1ca65 100644
--- a/src/using/fileformats.xml
+++ b/src/using/fileformats.xml
@@ -805,15 +805,15 @@ url="http://en.wikipedia.org/wiki/High_Efficiency_Image_File_Format";>Wikipedia</
<listitem>
<para>
<guilabel>None</guilabel>: is fast, and lossless, but the
- resulting file is very large.
+ resulting file can be very large.
</para>
</listitem>
<listitem>
<para>
<guilabel>LZW</guilabel>: The image is compressed
using the <quote>Lempel-Ziv-Welch</quote> algorithm, a
- lossless compression technique. This is old, but
- efficient and fast. More information at
+ lossless compression technique. This is efficient and fast.
+ More information at
<xref linkend="bibliography-online-wkpd-lzw"/>.
</para>
</listitem>
@@ -832,34 +832,38 @@ url="http://en.wikipedia.org/wiki/High_Efficiency_Image_File_Format";>Wikipedia</
<para>
<guilabel>Deflate</guilabel>: is a lossless data
compression algorithm that uses a combination of the LZ77
- algorithm and Huffman coding. It is also used in Zip,
- Gzip and PNG file formats. Source:
+ algorithm and Huffman coding. It is also used in Zip and
+ Gzip files and PNG images. Source:
<xref linkend="bibliography-online-wkpd-deflate"/>.
</para>
</listitem>
<listitem>
<para>
- <guilabel>JPEG</guilabel>: is a very good
- compression algorithm but lossy.
+ <guilabel>JPEG</guilabel>: is a very good compression
+ algorithm but lossy. This is the same compression as used in
+ JPEG images. Since it is lossy, you should not use this when
+ image quality is important. This compression can not be
+ used when your image is in indexed mode.
</para>
</listitem>
<listitem>
<para>
- <guilabel>CCITT Group 3 fax</guilabel>;
- <guilabel>CCITT Group 4 fax</guilabel> is a
- black and white format developed to transfer images by FAX.
+ <guilabel>CCITT Group 3 fax</guilabel> and
+ <guilabel>CCITT Group 4 fax</guilabel> are black and white
+ formats developed to transfer images by FAX.
</para>
<note>
<para>
- These options can only be selected, if the image is in
- indexed mode and reduced to two colors. Use
+ These two compression modes can only be selected, if the
+ image is in indexed mode and reduced to two colors. Use
<menuchoice>
<guimenu>Image</guimenu>
<guisubmenu>Mode</guisubmenu>
<guimenuitem>Indexed</guimenuitem>
</menuchoice>
- to convert the image to indexed. Be certain to check
- <quote>Use black and white (1-bit) palette</quote>.
+ to convert the image to indexed mode. Make sure that
+ <quote>Use black and white (1-bit) palette</quote> is
+ checked.
</para>
</note>
</listitem>
@@ -871,6 +875,20 @@ url="http://en.wikipedia.org/wiki/High_Efficiency_Image_File_Format";>Wikipedia</
<listitem>
<para>
Since GIMP-2.10.12, you can save layers when exporting to TIFF.
+ Each layer will be a separate page in the TIFF image.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Crop layers</term>
+ <listitem>
+ <para>
+ When <guilabel>Save layers</guilabel> is checked, this option,
+ which is enabled by default, will resize all layers to the size
+ of the image. TIFF images can not have negative offsets. This
+ option enables you to import the TIFF again without having to
+ change the position of layers that had a different size as the
+ image in the original.
</para>
</listitem>
</varlistentry>
@@ -878,32 +896,91 @@ url="http://en.wikipedia.org/wiki/High_Efficiency_Image_File_Format";>Wikipedia</
<term>Save color values from transparent pixels</term>
<listitem>
<para>
- With this option the color values are saved even if the pixels
+ When this is enabled the color values are saved even if the pixels
are completely transparent.
</para>
</listitem>
</varlistentry>
<varlistentry>
- <term>Comment</term>
+ <term>Metadata (edit)</term>
<listitem>
<para>
- In this text box, you can enter a comment that is
- associated with the image.
+ You can click the <quote>(edit)</quote> link to open the metadata
+ editor to change or add any metadata that you want to be
+ included in the image. Note: you will also still need to
+ enable the relevant metadata saving options listed below.
</para>
</listitem>
</varlistentry>
<varlistentry>
- <term>Keep metadata</term>
+ <term>Save Exif data</term>
<listitem>
<para>
- If the image you loaded has Exif, XMP, IPTC metadata, they are
- preserved, and you can keep them or not when exporting to TIFF.
+ When this option is enabled existing EXIF metadata will be saved
+ in the exported TIFF image.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Save IPTC data</term>
+ <listitem>
+ <para>
+ When this option is enabled existing IPTC metadata will be saved
+ in the exported TIFF image.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Save XMP data</term>
+ <listitem>
+ <para>
+ When this option is enabled existing XMP metadata will be saved
+ in the exported TIFF image.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Save color profile</term>
+ <listitem>
+ <para>
+ When this option is enabled the color profile will be saved in
+ the exported TIFF image.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Save thumbnail</term>
+ <listitem>
+ <para>
+ When this option is enabled a thumbnail will be saved as the
+ second page in the exported TIFF image. This will also cause
+ certain EXIF tags to be saved even if you have disabled saving
+ EXIF metadata.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Save GeoTIFF data</term>
+ <listitem>
+ <para>
+ When this option is enabled GeoTIFF metadata that was present in
+ the original image will be saved in the exported TIFF image.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Save comment</term>
+ <listitem>
+ <para>
+ Here you can enable saving a comment that is associated with the
+ image. The comment can be entered in the text box below this
+ option.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect3>
-
+
<sect3 id="file-mng-export">
<title>Export Image as MNG</title>
<indexterm>
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