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 Forum index » Advanced Topics » Additional Software (PETs, n' stuff) » Graphics
mtpaint 3.49.12- April 2016
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greengeek


Joined: 20 Jul 2010
Posts: 5827
Location: Republic of Novo Zelande

PostPosted: Thu 25 Jan 2018, 03:07    Post subject: Re: Eraser... How to create transparency....  

hamoudoudou wrote:
Eraser... How to create transparency.... how to erase with transparency ????
Where is the eraser? I can't find it
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mikeslr


Joined: 16 Jun 2008
Posts: 3893
Location: 500 seconds from Sol

PostPosted: Thu 25 Jan 2018, 11:18    Post subject: Eraser  

Hi g/g, hamoudoudou,

Edit: Sorry Guys, I was thinking gimp when I wrote the following. Embarassed

Eraser is one of the 'paint tools' --same panel as paint-brush, airbrush, etc. Looks like a pink cube. As far as I know, to 'erase with transparency' actually requires:

1. open desired image.
2. Click New, Select "Advanced Options", Click 'Down-Arrow' next to "Fill With Background Color', Select "Transparency", Click OK.
3. On the Original Image, from the Paint-tool panel, select one of the 'Area Selection" tools, such as 'Rectangle Select'. Use it to Select the entire or a part of the original image. Select Copy.
4. In the New Image, Select paste. Save the New Image [under a new name]. Close the old image.
5. When you erase something from the new image, all that is left is the transparent background.

Erasing has to be done before adding new layers.

I'd be pleased to learn if there was an easier way.

mikesLr
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sszindian


Joined: 24 Apr 2010
Posts: 807
Location: Pennsylvania U.S.

PostPosted: Sun 01 Jul 2018, 12:22    Post subject: Not Printing  

Deleted!
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darry19662018

Joined: 31 Mar 2018
Posts: 731
Location: Rakaia

PostPosted: Sun 18 Aug 2019, 01:47    Post subject:  

Don's link in first post seems to be dead so made this versioon from Slackware - made in Puppy 4.31 so should work in old Pups upwards.

https://archive.org/download/pup4.311glibc2.19palemoon2.794sserev1/mtpaint-3.40-i586-2.pet

P.S. Finally got into the account have reuploaded it to make it easier,

https://archive.org/download/pup4.311glibc2.19palemoon2.794sserev1/mtpaint-3.49.12.pet

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wjaguar

Joined: 21 Jun 2006
Posts: 359

PostPosted: Sun 18 Aug 2019, 11:36    Post subject:  

darry19662018 wrote:
https://archive.org/download/pup4.311glibc2.19palemoon2.794sserev1/mtpaint-3.49.12.pet

This is software necromancy. Smile The current version is 3.49.19: https://github.com/wjaguar/mtPaint/tree/master
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darry19662018

Joined: 31 Mar 2018
Posts: 731
Location: Rakaia

PostPosted: Sun 18 Aug 2019, 14:28    Post subject:  

wjaguar wrote:
darry19662018 wrote:
https://archive.org/download/pup4.311glibc2.19palemoon2.794sserev1/mtpaint-3.49.12.pet

This is software necromancy. Smile The current version is 3.49.19: https://github.com/wjaguar/mtPaint/tree/master


Mmm true but there hasn't been a new Puppy version in some time I was trying to find a newer one even on pkgs.org they are still at 3.40. Don doesn't seem to be on the scene anymore. Latest found Slitaz version 3.49.14 works for me:)

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8Geee


Joined: 12 May 2008
Posts: 2190
Location: N.E. USA

PostPosted: Sun 18 Aug 2019, 14:48    Post subject:  

my slacko5.7 is running 3.44.48

So whats the latest that runs on slacko5.7 without downloading other files, tweaks, libs, etc.?

Curious
8Geee

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darry19662018

Joined: 31 Mar 2018
Posts: 731
Location: Rakaia

PostPosted: Sun 18 Aug 2019, 14:56    Post subject:  

Sigh built this I'm happy:
https://archive.org/download/pup4.311glibc2.19palemoon2.794sserev1/mtpaint-3.49.14.pet

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wjaguar

Joined: 21 Jun 2006
Posts: 359

PostPosted: Mon 19 Aug 2019, 13:05    Post subject:  

8Geee wrote:
So whats the latest that runs on slacko5.7 without downloading other files, tweaks, libs, etc.?

Technically, any mtPaint version should build OK on anything more recent than year 2008, given that one of my test systems is still Slackware 12.1. Smile
And if it fails to build somewhere, report it as a bug and I'll fix it.
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don570


Joined: 10 Mar 2010
Posts: 5524
Location: Ontario

PostPosted: Mon 06 Jan 2020, 18:52    Post subject:  

I came across a very rare and obscure bug in mtpaint.
It involves the different rendering engines that the 3d program BLENDER
uses to display an image.

You can read it here if you're interested.

https://developer.blender.org/T72941

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wjaguar

Joined: 21 Jun 2006
Posts: 359

PostPosted: Tue 07 Jan 2020, 02:32    Post subject:  

don570 wrote:
I came across a very rare and obscure bug in mtpaint.

Wrong. The bug is in blender.
Image format specs, when we lucked to have them, are meant to be read. Test suites, when we have such, are meant to be used. Image loaders written by left hind appendage without engaging the brain, are meant to be fixed.
Let whoever is responsible for PNG loader in EEVEE, avail himself of this snippet of information: https://www.w3.org/TR/PNG/#11transinfo
Apparently, color key transparency got ignored, instead of being converted into an alpha plane. Which is a bug.
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don570


Joined: 10 Mar 2010
Posts: 5524
Location: Ontario

PostPosted: Tue 07 Jan 2020, 21:23    Post subject:  

Quote:
The bug is in blender

That is why I posted the bug in the blender forum.
_______________________________________

Recent versions of Blender have supported drag and drop of images
as well as setting up the nodes automatically for an alpha channel.

Maybe they forgot the PNG format spec in this rare case
of starting with a GIMP opaque document.


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wjaguar

Joined: 21 Jun 2006
Posts: 359

PostPosted: Tue 07 Jan 2020, 22:55    Post subject:  

don570 wrote:
That is why I posted the bug in the blender forum.

On observing the discussion "when a bug is a bug" there, maybe quoting me there in full was fitting. Smile Even if one in three devs has proven himself capable of reading docs on his own.
After your scaring me with the dreaded "bug in mtpaint" phrase however, I did characterize the coding practices which produced Blender's PNG loader a bit too harshly. Smile On actually looking at the code, the "left hind appendage" part does seem unwarranted as I've many times observed much worse. The "without engaging the brain" part stands, because see below.
Quote:
Maybe they forgot the PNG format spec in this rare case
of starting with a GIMP opaque document.

Which is exactly why testsuites for image formats exist. When they exist. Sad
But in case of PNG, it luckily does: http://www.schaik.com/pngsuite/
Including a nice series of examples of kinds of transparency possible in PNGs: http://www.schaik.com/pngsuite/pngsuite_trn_png.html

The worst and longest part of writing an image loader, is trawling the Internet in search of weirdest & nastiest example files to throw at it to test the corner cases. When you already have a testsuite ready to go, not using it is not thinking straight.
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don570


Joined: 10 Mar 2010
Posts: 5524
Location: Ontario

PostPosted: Thu 09 Jan 2020, 14:57    Post subject:  

Blender calls it a 'known issue' rather than a bug Laughing
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OscarTalks


Joined: 05 Feb 2012
Posts: 2199
Location: London, England

PostPosted: Thu 19 Mar 2020, 15:07    Post subject:  

I did a quick test build of mtpaint-3.49.25 using GTK3
Looks OK, but will probably stick with GTK2 build

My DpupStretch personal remaster (both .iso and devx) is set up so I can compile for GTK3 (without the wayland dependency).
I am using the "Ultimate Maia Violet" GTK3 theme and Adwaita icon theme (cut down a bit) for GTK3 programs

In older Pups such as Wheezy, I compile libwebp from source and configure mtpaint with staticwebp
mtpaint-gtk3.jpg
 Description   Test build using GTK3 in Stretch Pup
 Filesize   73.38 KB
 Viewed   171 Time(s)

mtpaint-gtk3.jpg


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