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Add documentation in alternative formats to HTML.
author David Barts <davidb@stashtea.com>
date Sat, 18 Apr 2020 09:08:23 -0700
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1 [This file automatically generated by pandoc from 'Readme.html'.]
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2
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3 Introducing JpegWasher
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4 ======================
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5
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6 Executive Summary
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7 -----------------
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8
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9 This program makes it easy to remove metadata from the digital images
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10 you create.
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11
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12 What is “Metadata” and Why Would I Want to Remove It?
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13 -----------------------------------------------------
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14
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15 You may not realize it, but image files can (and typically do!) contain
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16 more than just image data. These data can include your camera make,
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17 model, and serial number; the location where you took the photo; the
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18 software you used to edit the photo (and what editing steps you did);
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19 etc.
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20
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21 One of the most powerful uses of photography is to graphically document
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22 things that the wealthy and powerful might wish to remain concealed. The
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23 evils of slavery, child labor, poverty, war, and imperialism have all
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24 been documented photographically, and such photographs have often proved
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25 instrumental in helping to motivate social change.
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26
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27 Because of the metadata they contain, digital photographs contain data
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28 which has been used to determine who took them, and in some cases to
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29 exact retribution against those photographers. JpegWasher makes it easy
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30 to see and remove the privacy-compromising metadata in your images.
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31
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32 Even if your images are not of such a sensitive nature, that extra data
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33 takes up space. It is not uncommon for a 100 KiB image to contain 20 KiB
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34 of metadata in it; if that image is on a web page, that makes for 20 KiB
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35 of wasted network usage each time the image is sent.
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36
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37 What Makes JpegWasher Different from Other Metadata Editors?
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38 ------------------------------------------------------------
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39
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40 Simply put, it is designed to *safely* remove *unimportant* metadata
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41 from JPEG files.
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42
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43 There are plenty of general-purpose image metadata editors out there,
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44 and these tools can be employed to remove unimportant metadata. The
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45 trouble is, they are not user-friendly: it is up to you, the user, to
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46 know which metadata are unimportant, and to delete it.
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47
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48 There can be literally *hundreds* of bits of metadata in an image, and
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49 *not all are safe to remove*. In particular, if you accidentally remove
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50 color-management metadata, computers that don’t handle images without
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51 color-management metadata properly (I’m talking about *you*, Apple
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52 Computer, Inc.) will display colors that often look all “washed-out” or
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53 otherwise incorrect.
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54
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55 Likewise, there are already plenty of simple-to-use, user-friendly tools
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56 out there for cleaning the metadata out of image files, but they
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57 inevitably delete *all* metadata, resulting in files that often display
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58 improperly. Also of concern, many of these “tools” are actually online
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59 services. If you’re concerned about your privacy, why would you trust
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60 the images you’re processing to some unknown third party, who may be
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61 linked somehow to those who might want to retaliate against you?
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62
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63 I wrote this program because I wanted there to be a quick, easy way to
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64 scrub images before they even left a photographer’s computer and made
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65 their way onto the Internet, and for that program to leave vital
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66 metadata alone, so that the resulting images continue to display
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67 properly.
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68
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69 JpegWasher Washes More than Just Exif Metadata
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70 ----------------------------------------------
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71
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72 Jpeg is the most common type of metadata, but image files commonly
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73 contain compromising XMP or IPTC data, particularly if they have been
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74 edited with a tool like Photoshop. JpegWasher will seamlessly deal with
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75 these kinds of metadata, too. It tries to do as thorough a job as
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76 possible of scrubbing possibly compromising metadata from your images.
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77
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78 Using JpegWasher
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79 ----------------
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80
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81 Just double-click on the JpegWasher icon and a main window should open
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82 up. Either choose the File… Wash from the menu bar, or just drag image
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83 files onto the main JpegWasher image.
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84
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85 When JpegWasher opens an image, it displays all the metadata it finds.
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86 That metadata will be run through an internal whitelist, and any data
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87 whose “key” is not found on the whitelist will be automatically selected
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88 for deletion.
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89
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90 If you disagree with JpegWasher’s decisions, you can check or uncheck
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91 the boxes next to the metadata in question. When you are satisfied with
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92 the choice of metadata to be scrubbed, click “Wash” and all offending
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93 metadata will be removed. A dialog will pop up showing the metadata
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94 remaining in the new, washed file.
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95
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96 Important: Run JpegWasher Last!
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97 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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98
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99 Most image-editing tools insert telltale bits of metadata into the
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100 output they create. Thus, only way you can create a file with the
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101 minimum amount of metadata in it is to run JpegWasher as the final step
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102 in your image preparation.
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103
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104 Washing Non-JPEG Images
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105 ~~~~~~~~~~~~~~~~~~~~~~~
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106
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107 In short: it’s possible, but it is not recommended unless you *really*
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108 know what you’re doing.
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109
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110 JpegWasher is called JpegWasher for a reason: it is geared to cleaning
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111 metadata in *JPEG* files. Different types of images use metadata
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112 differently; metadata that would be extraneous deadwood in a JPEG can be
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113 critical to interpreting other image file formats correctly.
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114 JpegWasher’s built-in whitelist is geared to what must be retained when
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115 washing JPEG images, so *careless use of JpegWasher is likely to damage
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116 non-JPEG files.* It is for this reason that JpegWasher will warn you if
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117 you attempt to open and wash a non-JPEG file with it.
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118
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119 Output Files
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120 ------------
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121
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122 JpegWasher never modifies an existing image file. Instead, it creates a
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123 new file of the same type but with “_washed” appended to its name. For
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124 example, processing ``foo.jpg`` will create ``foo_washed.jpg``. By
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125 default, the new file will be created in the same directory as the file
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126 being washed.
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127
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128 JpegWasher is Configurable
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129 --------------------------
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130
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131 Both the whitelist and the destination directory for the washed files
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132 are user-configurable in the Preferences menu.
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133
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134 Configuring the Whitelist
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135 ~~~~~~~~~~~~~~~~~~~~~~~~~
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136
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137 There are two kinds of whitelist entries: those that match an entire
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138 metadata key, and those that match a key prefix. The latter end in an
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139 asterisk. The whitelist is case-sensitive; i.e. the entry
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140 ``exif.image.colormap`` *will not* match the ``Exif.Image.ColorMap``
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141 key.
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142
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143 That’s about It
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144 ---------------
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145
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146 JpegWasher does not, and probably never will, do anything but remove
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147 extraneous metadata from JPEG files.
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148
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149 First, I have no desire to re-invent the wheel. There are already
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150 excellent open-source tools like Gimp for image editing, and ExifTool
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151 and Exiv2 for general-purpose metadata editing (in fact, JpegWasher is
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152 built on top of Exiv2). If you need the functionality of some other
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153 tool, download and use it!
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154
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155 Second (and more importantly), I want JpegWasher to be simple, and
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156 therefore easy to learn and easy to use. The more challenging an
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157 information-security tool is to use, the less likely it is to be used
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158 frequently, and the more likely it is that compromising information gets
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159 disclosed.