Refactor image

[johnfercher]

Description

Related Issue

Checklist

check with "x", if applied to your change

• All methods associated with structs has func (s *struct) method() {} name style.
• Wrote unit tests for new/changed features.
• Updated docs/doc.go
• Updated pkg/pdf/example_test.go
• Updated README.md
• Updated all examples inside internal/examples
• New public methods/structs/interfaces has comments upside them explaining they responsibilities
• Executed make dod with none issues pointed out by golangci-lint and goreportcard-cli

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (fd3b1b0) 31.60% compared to head (6f0b638) 32.10%.

Additional details and impacted files

@@            Coverage Diff             @@
##               v2     #327      +/-   ##
==========================================
+ Coverage   31.60%   32.10%   +0.51%     
==========================================
  Files          19       19              
  Lines         937      944       +7     
==========================================
+ Hits          296      303       +7     
  Misses        634      634              
  Partials        7        7              

Flag	Coverage Δ
unittests	32.10% <93.75%> (+0.51%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
internal/code/code.go	89.75% <100.00%> (+2.25%)	⬆️
internal/image.go	0.00% <0.00%> (ø)

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