PGS Subtitle
Subtitles & CaptionsSUP can name bitmap subtitles such as PGS; establish the specific format first. It stores appearance/timing rather than ordinary caption text. An editor’s unreadable output does not imply damage. SRT migration can require OCR and proofreading.
- What it is used for
- Bitmap subtitle streams such as PGS
- What the file contains
- Producer-dependent
All sections, questions and sources
Content reviewed： · Editor：Kai
Opening steps
Choose your environment or purpose to see its steps.
Menu labels and support vary by app, OS and version. Preserve the original before making changes.
Troubleshooting by symptom
- Not readable as text: that is expected for bitmap captions; use a compatible tool.
- Wrong size/position: compare source video dimensions and caption placement.
- OCR errors: proofread the correct language, similar glyphs, punctuation and every cue.
- Unreadable text: check whether bitmap data was opened as plain text.
- Wrong names after OCR: compare and correct against source images.
- Size/placement changed: inspect reference dimensions and player scaling.
SUP bitmap captions → OCR → SRT
- Load the supported bitmap stream and configure the correct OCR language.
- Proofread results and verify timing/line breaks before saving SRT.
- Proofread all required lines and breaks against the source images.
OCR is imperfect; SRT normally loses original typeface/color/placement. Retain the source.
Bitmap versus text subtitles
PGS renders bitmap captions; visible glyphs are not directly extractable text.
Source for these steps：Subtitle Edit Project · Optical Character Recognition / Matroska · Codec Mappings / Subtitle Edit · Subtitle Edit project
Validate text and sync after OCR
Proofread all required cues against images for similar glyphs and punctuation.
Check sync at three positions and retain separate bitmap/text versions.
Source for these steps：Subtitle Edit Project · Optical Character Recognition / Matroska · Codec Mappings / Subtitle Edit · Subtitle Edit project
Related-format differences
| Format | Main role | What to check |
|---|---|---|
| SUP / PGS | Bitmap captions | Images/timing |
| SUB + IDX | Another bitmap subtitle format | Companion pair |
| SRT / VTT | Text captions | Proofreading/sync |
Handling and security
Check subtitle rights and avoid unauthorized cloud OCR of private captions/video.
Questions and answers
Can I rename it to SRT?
No; images do not become text.
Can I edit PGS words without OCR?
Text transcription/OCR is needed.
Is all SUP PGS?
No; verify the provider’s format.
How can I change a bitmap subtitle’s font?
For text styling, OCR and proofread a text copy, then assign a font.
Does OCR produce perfect captions?
Compare names, numbers, punctuation and breaks with the images.
Format facts: name, steward and MIME type
- Formal name
- Subtitle stream; commonly PGS bitmap subtitles
- Steward / specification
- Video/disc subtitle specifications
- MIME type
- Depends on the producer or server; an extension alone does not establish a MIME type.
Primary and official sources
- Official documentationOptical Character Recognition
OCR for image subtitles such as PGS and VobSub.
Subtitle Edit Project · Link checked： - Project documentationCodec Mappings
Defines codec identifiers carried in Matroska.
Matroska · Link checked： - Project documentationSubtitle Edit project
Official project for subtitle conversion and image-subtitle OCR.
Subtitle Edit · Link checked：