Print Page - Removing Pixel Scale and Model Tie Point

Title: Removing Pixel Scale and Model Tie Point
Post by: Kofi on May 17, 2021, 04:59:10 AM

Hi all,

I am trying to remove PixelScale and ModelTiePoint tags from IFD0 section of Metadata. Tried with -PixelScale= -ModelTiePoint= but got message saying these tags are not writable....

see extracted metadata from ExifTool

---- ExifTool ----
ExifTool Version Number : 12.12
---- System ----
File Name : dsm.tif
Directory : C:/Users/paul.pelletier/Downloads/marecaP3Pro
File Size : 18 MiB
File Modification Date/Time : 2021:05:14 17:24:33-05:00
File Access Date/Time : 2021:05:14 17:26:34-05:00
File Creation Date/Time : 2021:05:14 16:36:56-05:00
File Permissions : rw-rw-rw-
---- File ----
File Type : TIFF
File Type Extension : tif
MIME Type : image/tiff
Exif Byte Order : Little-endian (Intel, II)
---- IFD0 ----
Image Width : 3646
Image Height : 3493
Bits Per Sample : 32
Compression : LZW
Photometric Interpretation : BlackIsZero
Samples Per Pixel : 1
Planar Configuration : Chunky
Tile Width : 256
Tile Length : 256
Tile Offsets : (Binary data 1737 bytes, use -b option to extract)
Tile Byte Counts : (Binary data 1274 bytes, use -b option to extract)
Sample Format : Float
S Min Sample Value : 315.625122070313
S Max Sample Value : 339.354248046875
Pixel Scale : 0.0366757999999869 0.0366758000001102 0
Model Tie Point : 0 0 0 640738.884289963 4604970.83733696 0
GDAL No Data : -32767
---- Composite ----
Image Size : 3646x3493
Megapixels : 12.7

Is there a way to remove these tags?

Title: Re: Removing Pixel Scale and Model Tie Point
Post by: StarGeek on May 17, 2021, 01:49:49 PM

What is the exact message exiftool gives?

I was able to add and remove both of those tags using both the current version and ver 12.00 of exiftool

Code Select

C:\>exiftool -P -overwrite_original -PixelScale=".1 .2 .3" -ModelTiePoint=".4 .5 .6"  y:/!temp/Testtest.tif
    1 image files updated

C:\>exiftool -g1 -a -s -PixelScale -ModelTiePoint y:/!temp/Testtest.tif
---- IFD0 ----
PixelScale                      : 0.1 0.2 0.3
ModelTiePoint                   : 0.4 0.5 0.6

C:\>exiftool -P -overwrite_original -PixelScale= -ModelTiePoint= y:/!temp/Testtest.tif
    1 image files updated

C:\>exiftool -g1 -a -s -PixelScale -ModelTiePoint y:/!temp/Testtest.tif

C:\>

Title: Re: Removing Pixel Scale and Model Tie Point
Post by: Kofi on May 17, 2021, 11:21:17 PM

Thanks StarGeek,

it works when I specify a file or directory but originally I used following batch:

Code Select

exiftool -P -overwrite_original "-geotiff*=" -PixelScale= -ModelTiePoint= %1
and got following message after dragging my file (dsm.tif) onto batch file:

Code Select

Warning: Sorry, PixelScale is not writable
Warning: Sorry, ModelTiePoint is not writable
    0 image files updated
    1 image files unchanged

I guess that %1 is badly interpreted

Title: Re: Removing Pixel Scale and Model Tie Point
Post by: Phil Harvey on May 18, 2021, 03:56:46 PM

My guess is that your batch file is running a different version of ExifTool.

- Phil

Title: Re: Removing Pixel Scale and Model Tie Point
Post by: Kofi on May 18, 2021, 05:13:44 PM

Hello,

I am running version 12.12.... in both batches. One using %1 (with error)

Code Select

exiftool -P -overwrite_original "-geotiff*=" -PixelScale= -ModelTiePoint= %1
and one using directory (which works)

Code Select

exiftool -P -overwrite_original "-geotiff*=" -PixelScale= -ModelTiePoint= .\photos

PS. It works if I define the absolute path to exiftool in batch as:

Code Select

C:\Users\paul.pelletier\Documents\ExifTool\exiftool -P -overwrite_original "-geotiff*=" -PixelScale= -ModelTiePoint=  %1

Phil, you were right! Somehow I had an old version (9.99) installed in C:\Windows folder and when running the batch with %1 dragging a file from other directory, it would then try to run old exiftool in Windows directory....

Thanks for your help on this issue!

ExifTool Forum

General => Metadata => Topic started by: Kofi on May 17, 2021, 04:59:10 AM