# Issue using Images.jl to open a .tif image - OpenCV required

**URL:** https://discourse.julialang.org/t/issue-using-images-jl-to-open-a-tif-image-opencv-required/115940
**Category:** General Usage
**Tags:** package, dependency-issue
**Created:** [June 20, 2024, 5:13pm UTC](https://discourse.julialang.org/t/issue-using-images-jl-to-open-a-tif-image-opencv-required/115940 "2024-06-20T17:13:51Z")
**Posts on this page:** 3
**Page:** 1

<div class="post-metadata">

### Author: ![mward19](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mward19/32/209000_2.png) [@mward19](https://discourse.julialang.org/u/mward19)
#### Post date: [June 20, 2024, 5:13pm UTC](https://discourse.julialang.org/t/issue-using-images-jl-to-open-a-tif-image-opencv-required/115940/1 "2024-06-20T17:13:51Z")

</div>

I am trying to use TestImages.jl to load a .tif image, and running into an issue. The same issue occurs when I download the test image and try to open it with Images.jl and FileIO.jl. Images.jl and TestImages.jl claim that they require the OpenCV package.

With TestImages.jl:

```julia
julia> using TestImages

julia> mandril = testimage("mandril_gray.tif")
Errors encountered while load FileIO.File{FileIO.DataFormat{:TIFF}, String}("/home/matthew/.julia/artifacts/0fca6f56665d8dfa11bad924ab67e24e6fdbc0d7/mandril_gray.tif").
All errors:
===========================================
MethodError: no method matching load(::FileIO.File{FileIO.DataFormat{:TIFF}, String})

Closest candidates are:
  load(::IO; kwargs...)
   @ ImageIO ~/.julia/packages/ImageIO/uPn5K/src/ImageIO.jl:32
  load(::FileIO.Stream{FileIO.DataFormat{:PPMText}})
   @ ImageIO ~/.julia/packages/ImageIO/uPn5K/src/ImageIO.jl:58
  load(::FileIO.Stream{FileIO.DataFormat{:PGMText}})
   @ ImageIO ~/.julia/packages/ImageIO/uPn5K/src/ImageIO.jl:58
  ...

===========================================
/home/matthew/.julia/artifacts/0fca6f56665d8dfa11bad924ab67e24e6fdbc0d7/mandril_gray.tif: Null count for "Tag 34022" (type 1, writecount -3, passcount 1). `_TIFFVSetField' @ error/tiff.c/TIFFErrors/542
===========================================
ArgumentError: Package OpenCV [f878e3a2-a245-4720-8660-60795d644f2a] is required but does not seem to be installed:
 - Run `Pkg.instantiate()` to install all recorded dependencies.

===========================================

Fatal error:
ERROR: MethodError: no method matching load(::FileIO.File{FileIO.DataFormat{:TIFF}, String})

Closest candidates are:
  load(::IO; kwargs...)
   @ ImageIO ~/.julia/packages/ImageIO/uPn5K/src/ImageIO.jl:32
  load(::FileIO.Stream{FileIO.DataFormat{:PPMText}})
   @ ImageIO ~/.julia/packages/ImageIO/uPn5K/src/ImageIO.jl:58
  load(::FileIO.Stream{FileIO.DataFormat{:PGMText}})
   @ ImageIO ~/.julia/packages/ImageIO/uPn5K/src/ImageIO.jl:58
  ...

```

With Images.jl and FileIO.jl:

```julia
julia> using Images

julia> using FileIO

julia> data = load("/home/matthew/Downloads/mandril_gray.tif")
Errors encountered while load File{DataFormat{:TIFF}, String}("/home/matthew/Downloads/mandril_gray.tif").
All errors:
===========================================
MethodError: no method matching load(::File{DataFormat{:TIFF}, String})

Closest candidates are:
  load(::IO; kwargs...)
   @ ImageIO ~/.julia/packages/ImageIO/uPn5K/src/ImageIO.jl:32
  load(::Stream{DataFormat{:PPMText}})
   @ ImageIO ~/.julia/packages/ImageIO/uPn5K/src/ImageIO.jl:58
  load(::Stream{DataFormat{:PGMText}})
   @ ImageIO ~/.julia/packages/ImageIO/uPn5K/src/ImageIO.jl:58
  ...

===========================================
/home/matthew/Downloads/mandril_gray.tif: Null count for "Tag 34022" (type 1, writecount -3, passcount 1). `_TIFFVSetField' @ error/tiff.c/TIFFErrors/542
===========================================
ArgumentError: Package OpenCV [f878e3a2-a245-4720-8660-60795d644f2a] is required but does not seem to be installed:
 - Run `Pkg.instantiate()` to install all recorded dependencies.

===========================================

Fatal error:
ERROR: MethodError: no method matching load(::File{DataFormat{:TIFF}, String})

Closest candidates are:
  load(::IO; kwargs...)
   @ ImageIO ~/.julia/packages/ImageIO/uPn5K/src/ImageIO.jl:32
  load(::Stream{DataFormat{:PPMText}})
   @ ImageIO ~/.julia/packages/ImageIO/uPn5K/src/ImageIO.jl:58
  load(::Stream{DataFormat{:PGMText}})
   @ ImageIO ~/.julia/packages/ImageIO/uPn5K/src/ImageIO.jl:58
  ...

```

Based on a bit of internet research, it seems strange to me that Images.jl would depend on OpenCV just to open an image. What is going on here? I tried to install OpenCV.jl but ran into all kinds of issues with the C++ packages.

I am running Debian 12 on my system.

---

<div class="post-metadata">

### Author: ![devel-chm](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/devel-chm/32/3572_2.png) [@devel-chm](https://discourse.julialang.org/u/devel-chm)
#### Post date: [June 20, 2024, 5:26pm UTC](https://discourse.julialang.org/t/issue-using-images-jl-to-open-a-tif-image-opencv-required/115940/2 "2024-06-20T17:26:25Z")

</div>

FileIO has delegates for IO for TIFF images with

1. ImageIO
2. ImageMagick
3. OpenCV

Do you have ImageIO or ImageMagick installed?

---

<div class="post-metadata">

### Author: ![mward19](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mward19/32/209000_2.png) [@mward19](https://discourse.julialang.org/u/mward19)
#### Post date: [June 20, 2024, 5:36pm UTC](https://discourse.julialang.org/t/issue-using-images-jl-to-open-a-tif-image-opencv-required/115940/3 "2024-06-20T17:36:40Z")

</div>

After adding ImageIO, loading the images worked. Thank you!