[Qgis-user] Geotiff JPEG compression in Graphical Modeller

[Richard McDonnell]

Hi Grant,
You need to hit the "Show advanced parameters" button and the "Additional creation options" will appear. You then will have to add the "creation option"  (-co) values, separating them with a "|" (pipe I think it's called) so to add JPEG Compression you would have, without quotes, "COMPRESS=JPEG|JPEG_QUALITY=75", By default JPEG quality is at 75% so if you are leaving it at default, then you don't need the quality -co, but I added it there for completeness, this can be set to any value between 1 and 100
I hope that helps.
Kind Regards,

Richard.




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Richard McDonnell MSc GIS, FME Certified Professional
Flood Risk Management - Data Management

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From: boxerg at iinet.net.au <boxerg at iinet.net.au>
Sent: 24 March 2025 22:18
To: Richard McDonnell <richard.mcdonnell at opw.ie>
Subject: RE: [Qgis-user] Geotiff JPEG compression in Graphical Modeller

Hi Richard,

I can choose the JPEG compression if I use the save as option on a layer, but the jpeg option is not available when I run "save raster as" (gdal translate) in the graphical modeller.

Not sure why this option is not available.

Cheers Grant


From: Richard McDonnell <richard.mcdonnell at opw.ie<mailto:richard.mcdonnell at opw.ie>>
Sent: Monday, 24 March 2025 5:14 PM
To: Grant Boxer <boxerg at iinet.net.au<mailto:boxerg at iinet.net.au>>
Subject: RE: [Qgis-user] Geotiff JPEG compression in Graphical Modeller

Hi Grant,
It would depend on the last process your using to save out the raster.
If you use something like GDAL Translate or GDAL Warp and ar writing out GeoTiff, you can specify the "Tiff Tags" in the Creative Options, called "Advanced Parameters".
You can use JPEG compression by selecting the "JPEG Compression" Profile. The jpeg quality value can be increased or decreased as you require.
I hope that helps!
Kind Regards,

Richard.



--
Richard McDonnell MSc GIS, FME Certified Professional
Flood Risk Management - Data Management

--
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
--
M +353 87 688 5964 T +353 46 942 2409
https://gov.ie/opw

--
To send me files larger than 30MB, please use the link below https://filetransfer.opw.ie/filedrop/richard.mcdonnell@opw.ie

Email Disclaimer: https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/

From: QGIS-User <qgis-user-bounces at lists.osgeo.org<mailto:qgis-user-bounces at lists.osgeo.org>> On Behalf Of Grant Boxer via QGIS-User
Sent: 22 March 2025 10:05
To: qgis-user at lists.osgeo.org<mailto:qgis-user at lists.osgeo.org>
Subject: [Qgis-user] Geotiff JPEG compression in Graphical Modeller

I am creating RGB images with Sentinel 2 imagery using the graphical modeller and would like to use JPEG compression which reduces the image size substantially. The image files are "Float32 - Thirty two bit floating point" images. When I look at the compression options when saving the raster image in the graphical modeller, I do not get a JPEG compression option. The JPEG compression option is available if I click on the layer in the layers panel and "Save Raster As" under the Create Options. Any thoughts on why I can't select this in the graphical modeller options?
Cheers Grant
Perth, WAust
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