# DivideImageFilter with a constant?
**URL:** https://discourse.itk.org/t/divideimagefilter-with-a-constant/1241
**Category:** Engineering
**Created:** [August 31, 2018, 5:58pm UTC](https://discourse.itk.org/t/divideimagefilter-with-a-constant/1241 "2018-08-31T17:58:20Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@gdevenyi](https://discourse.itk.org/u/gdevenyi)
#### Post date: [August 31, 2018, 5:58pm UTC](https://discourse.itk.org/t/divideimagefilter-with-a-constant/1241/1 "2018-08-31T17:58:21Z")
The documentation for this deprecated filter:
[https://itk.org/Doxygen/html/classitk\_1\_1DivideByConstantImageFilter.html](https://itk.org/Doxygen/html/classitk_1_1DivideByConstantImageFilter.html)
Says DivideImageFilter can do the same thing, however I can’t find any detail on how, is it possible?
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### Author:  [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [August 31, 2018, 6:04pm UTC](https://discourse.itk.org/t/divideimagefilter-with-a-constant/1241/2 "2018-08-31T18:04:53Z")
Divide, Multiply etc filters have a `SetConstant` methods, e.g. [`SetConstant2`](https://itk.org/Doxygen/html/classitk_1_1BinaryGeneratorImageFilter.html#a65e0d35f1d48c42f29605914d30bcb51) to set the second image to the provided constant.
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### Author:  [@gdevenyi](https://discourse.itk.org/u/gdevenyi)
#### Post date: [August 31, 2018, 6:05pm UTC](https://discourse.itk.org/t/divideimagefilter-with-a-constant/1241/3 "2018-08-31T18:05:48Z")
Thanks @dzenanz
Where would I have found that? I can’t find any methods on the [https://itk.org/Doxygen/html/classitk\_1\_1DivideImageFilter.html](https://itk.org/Doxygen/html/classitk_1_1DivideImageFilter.html) page
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### Author:  [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [August 31, 2018, 6:09pm UTC](https://discourse.itk.org/t/divideimagefilter-with-a-constant/1241/4 "2018-08-31T18:09:01Z")
On that page, expand heading “Public methods inherited from BinaryGenerator…”
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### Author:  [@gdevenyi](https://discourse.itk.org/u/gdevenyi)
#### Post date: [August 31, 2018, 6:10pm UTC](https://discourse.itk.org/t/divideimagefilter-with-a-constant/1241/5 "2018-08-31T18:10:48Z")
Ahhh, that does not get included in a global text search if its closed 🙂
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### Author:  [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [August 31, 2018, 6:10pm UTC](https://discourse.itk.org/t/divideimagefilter-with-a-constant/1241/6 "2018-08-31T18:10:54Z")
Also, if your editor has code completion, write `filter->Set` and invoke auto-complete (Ctrl+space usually) or wait a little bit to get a list of methods starting with `Set`.
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### Author:  [@gdevenyi](https://discourse.itk.org/u/gdevenyi)
#### Post date: [August 31, 2018, 6:11pm UTC](https://discourse.itk.org/t/divideimagefilter-with-a-constant/1241/7 "2018-08-31T18:11:26Z")
Good point, I should figure out how to make Atom properly parse and complete this stuff.
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### Author:  [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [August 31, 2018, 6:15pm UTC](https://discourse.itk.org/t/divideimagefilter-with-a-constant/1241/8 "2018-08-31T18:15:12Z")
Or use an IDE instead of a text editor 😃
I am not very hopeful about text editors giving good auto-complete results on heavily templated code. Even Visual Studio and Qt Creator are frequently losing the auto-complete during constant git version updates in my working copy ☹
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### Author:  [@gdevenyi](https://discourse.itk.org/u/gdevenyi)
#### Post date: [August 31, 2018, 6:16pm UTC](https://discourse.itk.org/t/divideimagefilter-with-a-constant/1241/9 "2018-08-31T18:16:29Z")
[https://atom.io/](https://atom.io/) can definitely do it, but as mentioned in other threads, I’m just getting up to speed on C++ and so I’m not sure I’m using it “right” yet in terms of getting things parsed and such. Thanks!@
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### Author:  [@phcerdan](https://discourse.itk.org/u/phcerdan)
#### Post date: [August 31, 2018, 6:38pm UTC](https://discourse.itk.org/t/divideimagefilter-with-a-constant/1241/10 "2018-08-31T18:38:38Z")
Editors FTW! 😛
Autocompletion in headers in c++ is a hard task, especially because the headers are headers, and they are not recognized by `compile_commands.json` that many clang-tools use.
But there is indeed IDE features that works good in editors, I would recommend you have a look to LanguageServerProtocols (LSP), in c++ there are two, [cquery](https://github.com/cquery-project/cquery) and `clangd`. I would recommend right now `cquery`, but don’t miss `clangd` in the future, which lives inside the codebase of the clang compiler :). Cquery creates an index/database, IDE style, and you can call it from whatever connector Atom or any other editor has for LSP’s.
By the way, I have a hacky fork of the linter in vim `w0rp/ALE` [here](https://github.com/phcerdan/ale), that provides linting in template headers providing a `cpp` file that uses that header, and the `compile_commands.json` that can be generated by cmake with the option: `-DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=ON`.