Retocamos la imagen para corregir la decoloración.

Yes — retocamos can mean either:

• present indicative: we retouch / we edit / we touch up
• preterite: we retouched / we edited / we touched up

This happens with many -ar verbs in Spanish: the nosotros form is the same in the present and the preterite.

So the exact meaning depends on context:

• Retocamos la imagen cada semana = We retouch the image every week
• Ayer retocamos la imagen = Yesterday we retouched the image

On its own, the sentence is grammatically correct with either reading.

Spanish often leaves out subject pronouns because the verb ending already shows who is doing the action.

• Retocamos already tells you the subject is we
• So Nosotros retocamos la imagen... is possible, but usually unnecessary

You would add nosotros only for emphasis, contrast, or clarity:

• Nosotros retocamos la imagen, no ellos = We retouched the image, not them

Retocar means to retouch, to touch up, or sometimes to edit slightly.

With la imagen, it suggests making small corrections or improvements to an image, photo, or graphic rather than completely changing it.

So retocamos la imagen could mean things like:

• adjusting colour
• fixing blemishes
• improving lighting
• correcting visual defects

It often implies a minor or corrective edit, not a total redesign.

Because grammatical gender in Spanish is not determined only by the last letter. Imagen is a feminine noun:

• la imagen
• una imagen
• la imagen bonita

A lot of feminine nouns do end in -a, but not all of them. Imagen is simply one of the feminine nouns you need to learn with its article.

Para + infinitive is a very common way to express purpose in Spanish.

So:

• para corregir = in order to correct / to correct

In the sentence:

• Retocamos la imagen para corregir la decoloración

the second part explains why the image was retouched: the purpose was to correct the discoloration.

This structure is extremely common:

• Estudio para aprender = I study to learn
• Lo hice para ayudarte = I did it to help you

Spanish often uses the definite article more often than English does.

Here, la decoloración refers to a specific discoloration affecting the image, so la sounds natural.

• corregir la decoloración = to correct the discoloration

Leaving out the article would usually sound less natural in this sentence.

Decoloración means discoloration, loss of colour, or fading/bleaching, depending on context.

In an image-editing context, it usually refers to an unwanted colour problem, such as:

• faded colours
• uneven colour
• loss of pigmentation or tone
• bleaching or washed-out areas

So here it likely means some kind of colour defect in the image that needed correcting.

Because in Spanish, the normal word order is often:

• verb + direct object

So:

• Retocamos la imagen

is completely standard: We retouched the image.

You could also say:

• La imagen la retocamos para corregir la decoloración

but that changes the emphasis and sounds more marked. The original sentence uses the most neutral order.

Often, yes. Corregir literally means to correct, but in many contexts it works like to fix when talking about errors, defects, or problems.

So in this sentence:

• corregir la decoloración

can mean:

• to correct the discoloration
• to fix the discoloration

If you want to sound a bit more technical or precise, correct is closer. If you want more natural everyday English, fix may sound better.

Yes. That is a very reasonable translation.

The best English choice depends on context:

• retouched = more specifically about visual touch-ups, often photos
• edited = broader and more general
• touched up = natural and common in everyday English

So all of these could work:

• We retouched the image to correct the discoloration
• We edited the image to correct the discoloration
• We touched up the image to correct the discoloration

Retocamos strongly suggests some kind of visual adjustment, so retouched or touched up may be the closest choices.

A careful Spain pronunciation would be approximately:

• reh-toh-KAH-mos la ee-MAH-hen PA-ra koh-rreh-KHEER la deh-koh-loh-rah-THYON

A few useful points for Peninsular Spanish:

• c before i in corregir is actually g there, so that word has a strong j-like sound in -gir
• c before i/e and z in much of Spain are pronounced with the th sound of think
• so decoloración ends with -THYON in most of Spain

If you pronounce it with Latin American s sounds instead, it will still be understood.