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Where does the “Original size” of a picture in Microsoft Word come from?

Posted on July 20, 2012 by Ludwig
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When a picture is inserted in a Microsoft Office Word document it is scaled to fit. The size can be set to other values to suit the document. In the Size dialog window the size of the picture is shown in inches and as a percentage of the “Original size” which is also given as the height and width in inches. So, how does Word come up with the “original size”?

The EXIF data of photo files contains a couple of values name “X resolution” and “Y resolution”. In a Windows Properties box they show up as “Horizontal resolution” and “Vertical resolution” and are given in “dpi”. That last item, the unit of measure, “dpi”, stands for “dots per inch”. There is your big clue. Using “dots” was the way pictures were printed on paper in the old days. Well, if you pick up a newspaper you can still see them nowadays.

These resolution values do not describe anything relating to the picture, they are setting instructions for printers. They can be changed by a number of programs. Changing these values does not affect the picture at all. The number of pixels stays the same, the color depth is not affected. So these values can be changed at will. Several programs, in fact, do that. Cameras set these values, most to 300, some to other values. When Windows Live Photo Gallery makes a JPG copy of a photo it sets the values to 72. Some other editors use 96. I have one that uses 472, another 262. It really does not matter.

For the most part these numbers are meaningless. Microsoft Office Word, however, uses these resolution values as they were originally intended: As printing instructions specifying the dimensions of the printed picture on paper. If you have a photo that is 768 pixels wide and the horizontal resolution value is set to 96, then the picture printed size is 8 inches (8 inch multiplied by 96 dots per inch yields 768 dots – the pixels dimension of the picture).

So Word will set the “100%” size to 8.0 inch – if this does not fit in the margin settings, the picture will be scaled down and the Scale value will be a lower number.Office-31

Normally that is not a problem as most pictures have either 72 or 96 set as the resolution value. If the 768 pixel wide picture had the resolution set to 256 then Word would calculate the width as 768 / 256 = 3 inches. It would most like be set to that value and look somewhat small. It is perfectly acceptable to increase the size setting. If you want the picture to appear 6 inch wide you can set the scale to 200%. Word keeps the original number of pixels of the picture intact until the document is printed or saved with certain save or export options.

.:.

© 2012 Ludwig Keck

Technorati Tags: Word,Microsoft Office,pictures,EXIF data,resolution,Photo Gallery,photography,metadata
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Posted in Microsoft Office, Photo Gallery, Photography, Word | Tagged EXIF data, metadata, Microsoft Office, Photo Gallery, photography, pictures, resolution, Word | Leave a reply

Does the properties removal option in Windows Explorer remove all metadata?

Posted on April 10, 2011 by Ludwig
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The option “Remove Properties and Personal Information” on the Details tab of Properties can be used to remove data. It does not remove all data. When the link is clicked another dialog “Remove Properties” opens with detail choices.

image

image

The options are: “Create a copy with all possible properties removed” and “Remove the following properties from this file:” The second option allows specific data to be selected for removal. In either case a copy of the file is produced. The new file will have a variety of the properties still in the file. For the example of a dogwood blossom photo used here to illustrate the process, a number of data items remained and can still be seen in Properties. Some other data that is not shown in properties also is still embedded in the file.

image

Do not rely on this tool to clear all metadata.

When I want pretty much all data removed, I open the photo in Paint, select all of the photo and copy (Ctrl-C) the selected area. I then paste it into a new Paint window and save the result. For just one or a few photos, that is a faster method than using a special tool.

References:

Metadata: There is more in your photos than meets the eye!

Metadata: Managing information with Windows Explorer

Metadata: Geotagging and More with Microsoft Pro Photo Tools

Set Photo Gallery to remove sensitive data from photos prior to uploading

 

Technorati Tags: Photography,digital pictures,digital images,metadata,Windows Explorer,geotagging,removing metadata

 

.:. © 2011 Ludwig Keck

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Posted in Photography, Sharing photos | Tagged digital images, digital pictures, geotagging, metadata, photography, removing metadata, Windows Explorer | Leave a reply

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