When saving a drawing as .png, what is the best way to obtain a smaller file size (from say 42Kb) while retaining the same pixel size (say 600x600)?
Obviously there may be some loss of resolution,
Thanks,
Dave.
[Solved] Reduce PNG file size while retaining pixel size
-
SpeedCameraReport
- Posts: 7
- Joined: Thu Apr 07, 2022 5:55 pm
[Solved] Reduce PNG file size while retaining pixel size
Last edited by SpeedCameraReport on Fri Apr 15, 2022 5:47 pm, edited 1 time in total.
OpenOffice v4.1.11 on Windows
Re: How to reduce file size while retaining pixel size (.png
If you want to keep the same pixel count the only way is to reduce the colours from 24 bit to 8 bit, or even 4 bit or 2 bit. See the tutorial on images or save the PNG as a GIF which reduces it to 8 bit colours.
Why do want to do it? A 42kB image is tiny.
Why do want to do it? A 42kB image is tiny.
LO 6.4.4.2, Windows 10 Home 64 bit
See the Writer Guide, the Writer FAQ, the Writer Tutorials and Writer for students.
Remember: Always save your Writer files as .odt files. - see here for the many reasons why.
See the Writer Guide, the Writer FAQ, the Writer Tutorials and Writer for students.
Remember: Always save your Writer files as .odt files. - see here for the many reasons why.
-
SpeedCameraReport
- Posts: 7
- Joined: Thu Apr 07, 2022 5:55 pm
Re: How to reduce file size while retaining pixel size (.png
Hi John Ha.
Reducing the colours seems worth trying, how do you "reduce the colours from 24 bit to 8 bit"? Can't seem to find the settings for that.
Thanks,
Dave.
Reducing the colours seems worth trying, how do you "reduce the colours from 24 bit to 8 bit"? Can't seem to find the settings for that.
Thanks,
Dave.
OpenOffice v4.1.11 on Windows
Re: How to reduce file size while retaining pixel size (.png
It's all in the Tutorial. See [Tutorial] Some useful hints on using images.
LO 6.4.4.2, Windows 10 Home 64 bit
See the Writer Guide, the Writer FAQ, the Writer Tutorials and Writer for students.
Remember: Always save your Writer files as .odt files. - see here for the many reasons why.
See the Writer Guide, the Writer FAQ, the Writer Tutorials and Writer for students.
Remember: Always save your Writer files as .odt files. - see here for the many reasons why.
-
SpeedCameraReport
- Posts: 7
- Joined: Thu Apr 07, 2022 5:55 pm
Re: How to reduce file size while retaining pixel size (.png
Yes, I have read through it but couldn't find how to reduce the colours.
I'll look again ...
I'll look again ...
OpenOffice v4.1.11 on Windows
Re: How to reduce file size while retaining pixel size (.png
7. Use 256 colour (8 bit) images instead of 16 million colour (24 bit) images if possible
In IrfanView go Image > Decrease colour depth.
If you have scanned an image of a page, the white background will be many different shades, all close to, but not exactly [255,255,255] or [128,128,128]. Use Replace colour and set a tolerance of 20 or more - this makes all the "almost white" exactly white. As the values are now all identical they will compress much more.
In IrfanView go Image > Decrease colour depth.
If you have scanned an image of a page, the white background will be many different shades, all close to, but not exactly [255,255,255] or [128,128,128]. Use Replace colour and set a tolerance of 20 or more - this makes all the "almost white" exactly white. As the values are now all identical they will compress much more.
LO 6.4.4.2, Windows 10 Home 64 bit
See the Writer Guide, the Writer FAQ, the Writer Tutorials and Writer for students.
Remember: Always save your Writer files as .odt files. - see here for the many reasons why.
See the Writer Guide, the Writer FAQ, the Writer Tutorials and Writer for students.
Remember: Always save your Writer files as .odt files. - see here for the many reasons why.
-
SpeedCameraReport
- Posts: 7
- Joined: Thu Apr 07, 2022 5:55 pm
Re: How to reduce file size while retaining pixel size (.png
I cannot find anywhere in Open office "Draw" to reduce colours and the tutorial recommends IrfanView as well.
Found that setting "Interlaced" off reduces file size. Doesn't seem to affect the image though.
Thanks.
Found that setting "Interlaced" off reduces file size. Doesn't seem to affect the image though.
Thanks.
OpenOffice v4.1.11 on Windows
Re: How to reduce file size while retaining pixel size (.png
It is NOT an Apache Openoffice feature. You must use a third party pixelgraphic editor or manager software for this task - before you embed the image into an OpenOffice document.Reducing the colours seems worth trying, how do you "reduce the colours from 24 bit to 8 bit"? Can't seem to find the settings for that.
Tibor Kovacs, Hungary; LO7.5.8 /Win7-10 x64Prof.
PortableApps/winPenPack: LO3.3.0-7.6.2;AOO4.1.14
Please, edit the initial post in the topic: add the word [Solved] at the beginning of the subject line - if your problem has been solved.
PortableApps/winPenPack: LO3.3.0-7.6.2;AOO4.1.14
Please, edit the initial post in the topic: add the word [Solved] at the beginning of the subject line - if your problem has been solved.
-
SpeedCameraReport
- Posts: 7
- Joined: Thu Apr 07, 2022 5:55 pm
Re: How to reduce file size while retaining pixel size (.png
Thanks Zizi64, that'll explain why I couldn't find it ! 
OpenOffice v4.1.11 on Windows